Merge pull request #15591 from peppy/fix-android-score-imports

Fix android score imports not working

.config/dotnet-tools.json

@@ -14,8 +14,8 @@
         "jb"
       ]
     },
-    "smoogipoo.nvika": {
-      "version": "1.0.1",
+    "nvika": {
+      "version": "2.2.0",
       "commands": [
         "nvika"
       ]
@@ -27,7 +27,7 @@
       ]
     },
     "ppy.localisationanalyser.tools": {
-      "version": "2021.705.0",
+      "version": "2021.725.0",
       "commands": [
         "localisation"
       ]

.editorconfig

@@ -113,7 +113,7 @@ dotnet_style_qualification_for_event = false:warning
 dotnet_style_predefined_type_for_locals_parameters_members = true:warning
 dotnet_style_predefined_type_for_member_access = true:warning
 csharp_style_var_when_type_is_apparent = true:none
-csharp_style_var_for_built_in_types = true:none
+csharp_style_var_for_built_in_types = false:warning
 csharp_style_var_elsewhere = true:silent
 
 #Style - modifiers
@@ -190,3 +190,5 @@ dotnet_diagnostic.CA2225.severity = none
 
 # Banned APIs
 dotnet_diagnostic.RS0030.severity = error
+
+dotnet_diagnostic.OLOC001.license_header = // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.\n// See the LICENCE file in the repository root for full licence text.

.github/FUNDING.yml

@@ -1 +1,2 @@
+github: ppy
 custom: https://osu.ppy.sh/home/support

.github/ISSUE_TEMPLATE/01-bug-issues.md

@@ -1,30 +0,0 @@
----
-name: Bug Report
-about: Report a bug or crash to desktop
----
-
-<!--
-IMPORTANT: Your issue may already be reported.
-
-Please check:
-- Pinned issues, at the top of https://github.com/ppy/osu/issues
-- Current priority 0 issues at https://github.com/ppy/osu/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc+label%3Apriority%3A0
-- Search for your issue. If you find that it already exists, please respond with a reaction or add any further information that may be helpful.
--->
-
-
-**Describe the bug:** 
-
-**Screenshots or videos showing encountered issue:** 
-
-**osu!lazer version:** 
-
-**Logs:**
-
-<!--
-*please attach logs here, which are located at:*
-- `%AppData%/osu/logs` *(on Windows),*
-- `~/.local/share/osu/logs` *(on Linux & macOS).*
-- `Android/data/sh.ppy.osulazer/files/logs` *(on Android)*,
-- on iOS they can be obtained by connecting your device to your desktop and copying the `logs` directory from the app's own document storage using iTunes. (https://support.apple.com/en-us/HT201301#copy-to-computer)
--->

.github/ISSUE_TEMPLATE/config.yml

@@ -1,12 +1,12 @@
 blank_issues_enabled: false
 contact_links:
-    - name: Suggestions or feature request
-      url: https://github.com/ppy/osu/discussions/categories/ideas
-      about: Got something you think should change or be added? Search for or start a new discussion!
     - name: Help
       url: https://github.com/ppy/osu/discussions/categories/q-a
       about: osu! not working as you'd expect? Not sure it's a bug? Check the Q&A section!
+    - name: Suggestions or feature request
+      url: https://github.com/ppy/osu/discussions/categories/ideas
+      about: Got something you think should change or be added? Search for or start a new discussion!
     - name: osu!stable issues
       url: https://github.com/ppy/osu-stable-issues
-      about: For osu!stable bugs (not osu!lazer), check out the dedicated repository. Note that we only accept serious bug reports.
+      about: For osu!(stable) - ie. the current "live" game version, check out the dedicated repository. Note that this is for serious bug reports only, not tech support.
 

.github/dependabot.yml

@@ -5,7 +5,7 @@ updates:
   schedule:
     interval: monthly
     time: "17:00"
-  open-pull-requests-limit: 99
+  open-pull-requests-limit: 0 # disabled until https://github.com/dependabot/dependabot-core/issues/369 is resolved.
   ignore:
   - dependency-name: Microsoft.EntityFrameworkCore.Design
     versions:

.github/workflows/ci.yml

@@ -50,6 +50,55 @@ jobs:
           name: osu-test-results-${{matrix.os.prettyname}}-${{matrix.threadingMode}}
           path: ${{github.workspace}}/TestResults/TestResults-${{matrix.os.prettyname}}-${{matrix.threadingMode}}.trx
 
+  build-only-android:
+    name: Build only (Android)
+    runs-on: macos-latest
+    timeout-minutes: 60
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      # Pin Xamarin.Android version to 11.2 for now to avoid build failures caused by a Xamarin-side regression.
+      # See: https://github.com/xamarin/xamarin-android/issues/6284
+      # This can be removed/reverted when the fix makes it to upstream and is deployed on github runners.
+      - name: Set default Xamarin SDK version
+        run: |
+            $VM_ASSETS/select-xamarin-sdk-v2.sh --mono=6.12 --android=11.2
+
+      - name: Install .NET 5.0.x
+        uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: "5.0.x"
+
+      # Contrary to seemingly any other msbuild, msbuild running on macOS/Mono
+      # cannot accept .sln(f) files as arguments.
+      # Build just the main game for now.
+      - name: Build
+        run: msbuild osu.Android/osu.Android.csproj /restore /p:Configuration=Debug
+
+  build-only-ios:
+    # While this workflow technically *can* run, it fails as iOS builds are blocked by multiple issues.
+    # See https://github.com/ppy/osu-framework/issues/4677 for the details.
+    # The job can be unblocked once those issues are resolved and game deployments can happen again.
+    if: false
+    name: Build only (iOS)
+    runs-on: macos-latest
+    timeout-minutes: 60
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Install .NET 5.0.x
+        uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: "5.0.x"
+
+      # Contrary to seemingly any other msbuild, msbuild running on macOS/Mono
+      # cannot accept .sln(f) files as arguments.
+      # Build just the main game for now.
+      - name: Build
+        run: msbuild osu.iOS/osu.iOS.csproj /restore /p:Configuration=Debug
+
   inspect-code:
     name: Code Quality
     runs-on: ubuntu-latest
@@ -79,9 +128,14 @@ jobs:
         run: |
           # TODO: Add ignore filters and GitHub Workflow Command Reporting in CFS. That way we don't have to do this workaround.
           # FIXME: Suppress warnings from templates project
-          dotnet codefilesanity | while read -r line; do
-            echo "::warning::$line"
-          done
+          exit_code=0
+          while read -r line; do
+            if [[ ! -z "$line" ]]; then
+              echo "::error::$line"
+              exit_code=1
+            fi
+          done <<< $(dotnet codefilesanity)
+          exit $exit_code
 
       # Temporarily disabled due to test failures, but it won't work anyway until the tool is upgraded.
       # - name: .NET Format (Dry Run)

.github/workflows/diffcalc.yml

@@ -0,0 +1,206 @@
+# Listens for new PR comments containing !pp check [id], and runs a diffcalc comparison against master.
+# Usage:
+#   !pp check 0        | Runs only the osu! ruleset.
+#   !pp check 0 2      | Runs only the osu! and catch rulesets.
+#
+
+name: Difficulty Calculation
+on:
+  issue_comment:
+    types: [ created ]
+
+env:
+  CONCURRENCY: 4
+  ALLOW_DOWNLOAD: 1
+  SAVE_DOWNLOADED: 1
+  SKIP_INSERT_ATTRIBUTES: 1
+
+jobs:
+  metadata:
+    name: Check for requests
+    runs-on: self-hosted
+    if: github.event.issue.pull_request && contains(github.event.comment.body, '!pp check') && (github.event.comment.author_association == 'MEMBER' || github.event.comment.author_association == 'OWNER')
+    outputs:
+      matrix: ${{ steps.generate-matrix.outputs.matrix }}
+      continue: ${{ steps.generate-matrix.outputs.continue }}
+    steps:
+      - name: Construct build matrix
+        id: generate-matrix
+        run: |
+          if [[ "${{ github.event.comment.body }}" =~ "osu" ]] ; then
+            MATRIX_PROJECTS_JSON+='{ "name": "osu", "id": 0 },'
+          fi
+          if [[ "${{ github.event.comment.body }}" =~ "taiko" ]] ; then
+            MATRIX_PROJECTS_JSON+='{ "name": "taiko", "id": 1 },'
+          fi
+          if [[ "${{ github.event.comment.body }}" =~ "catch" ]] ; then
+            MATRIX_PROJECTS_JSON+='{ "name": "catch", "id": 2 },'
+          fi
+          if [[ "${{ github.event.comment.body }}" =~ "mania" ]] ; then
+            MATRIX_PROJECTS_JSON+='{ "name": "mania", "id": 3 },'
+          fi
+
+          if [[ "${MATRIX_PROJECTS_JSON}" != "" ]]; then
+            MATRIX_JSON="{ \"ruleset\": [ ${MATRIX_PROJECTS_JSON} ] }"
+            echo "${MATRIX_JSON}"
+            CONTINUE="yes"
+          else
+            CONTINUE="no"
+          fi
+
+          echo "::set-output name=continue::${CONTINUE}"
+          echo "::set-output name=matrix::${MATRIX_JSON}"
+  diffcalc:
+    name: Run
+    runs-on: self-hosted
+    timeout-minutes: 1440
+    if: needs.metadata.outputs.continue == 'yes'
+    needs: metadata
+    strategy:
+      matrix: ${{ fromJson(needs.metadata.outputs.matrix) }}
+    steps:
+      - name: Verify MySQL connection from host
+        run: |
+          mysql -e "SHOW DATABASES"
+
+      - name: Drop previous databases
+        run: |
+          for db in osu_master osu_pr
+          do
+            mysql -e "DROP DATABASE IF EXISTS $db"
+          done
+
+      - name: Create directory structure
+        run: |
+          mkdir -p $GITHUB_WORKSPACE/master/
+          mkdir -p $GITHUB_WORKSPACE/pr/
+
+      - name: Get upstream branch # https://akaimo.hatenablog.jp/entry/2020/05/16/101251
+        id: upstreambranch
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          echo "::set-output name=branchname::$(curl -H "Authorization: token ${GITHUB_TOKEN}" ${{ github.event.issue.pull_request.url }} | jq '.head.ref' | sed 's/\"//g')"
+          echo "::set-output name=repo::$(curl -H "Authorization: token ${GITHUB_TOKEN}" ${{ github.event.issue.pull_request.url }} | jq '.head.repo.full_name' | sed 's/\"//g')"
+
+      # Checkout osu
+      - name: Checkout osu (master)
+        uses: actions/checkout@v2
+        with:
+          path: 'master/osu'
+      - name: Checkout osu (pr)
+        uses: actions/checkout@v2
+        with:
+          path: 'pr/osu'
+          repository: ${{ steps.upstreambranch.outputs.repo }}
+          ref: ${{ steps.upstreambranch.outputs.branchname }}
+
+      - name: Checkout osu-difficulty-calculator (master)
+        uses: actions/checkout@v2
+        with:
+          repository: ppy/osu-difficulty-calculator
+          path: 'master/osu-difficulty-calculator'
+      - name: Checkout osu-difficulty-calculator (pr)
+        uses: actions/checkout@v2
+        with:
+          repository: ppy/osu-difficulty-calculator
+          path: 'pr/osu-difficulty-calculator'
+
+      - name: Install .NET 5.0.x
+        uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: "5.0.x"
+
+      # Sanity checks to make sure diffcalc is not run when incompatible.
+      - name: Build diffcalc (master)
+        run: |
+          cd $GITHUB_WORKSPACE/master/osu-difficulty-calculator
+          ./UseLocalOsu.sh
+          dotnet build
+      - name: Build diffcalc (pr)
+        run: |
+          cd $GITHUB_WORKSPACE/pr/osu-difficulty-calculator
+          ./UseLocalOsu.sh
+          dotnet build
+
+      - name: Download + import data
+        run: |
+          PERFORMANCE_DATA_NAME=$(curl https://data.ppy.sh/ | grep performance_${{ matrix.ruleset.name }}_top_1000 | tail -1 | awk -F "\"" '{print $2}' | sed 's/\.tar\.bz2//g')
+          BEATMAPS_DATA_NAME=$(curl https://data.ppy.sh/ | grep osu_files | tail -1 | awk -F "\"" '{print $2}' | sed 's/\.tar\.bz2//g')
+
+          # Set env variable for further steps.
+          echo "BEATMAPS_PATH=$GITHUB_WORKSPACE/$BEATMAPS_DATA_NAME" >> $GITHUB_ENV
+
+          cd $GITHUB_WORKSPACE
+
+          echo "Downloading database dump $PERFORMANCE_DATA_NAME.."
+          wget -q -nc https://data.ppy.sh/$PERFORMANCE_DATA_NAME.tar.bz2
+          echo "Extracting.."
+          tar -xf $PERFORMANCE_DATA_NAME.tar.bz2
+
+          echo "Downloading beatmap dump $BEATMAPS_DATA_NAME.."
+          wget -q -nc https://data.ppy.sh/$BEATMAPS_DATA_NAME.tar.bz2
+          echo "Extracting.."
+          tar -xf $BEATMAPS_DATA_NAME.tar.bz2
+
+          cd $PERFORMANCE_DATA_NAME
+
+          for db in osu_master osu_pr
+          do
+            echo "Setting up database $db.."
+
+            mysql -e "CREATE DATABASE $db"
+
+            echo "Importing beatmaps.."
+            cat osu_beatmaps.sql | mysql $db
+            echo "Importing beatmapsets.."
+            cat osu_beatmapsets.sql | mysql $db
+
+            echo "Creating table structure.."
+            mysql $db -e 'CREATE TABLE `osu_beatmap_difficulty` (
+                `beatmap_id` int unsigned NOT NULL,
+                `mode` tinyint NOT NULL DEFAULT 0,
+                `mods` int unsigned NOT NULL,
+                `diff_unified` float NOT NULL,
+                `last_update` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+                PRIMARY KEY (`beatmap_id`,`mode`,`mods`),
+                KEY `diff_sort` (`mode`,`mods`,`diff_unified`)
+              ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;'
+          done
+
+      - name: Run diffcalc (master)
+        env:
+          DB_NAME: osu_master
+        run: |
+          cd $GITHUB_WORKSPACE/master/osu-difficulty-calculator/osu.Server.DifficultyCalculator
+          dotnet run -c:Release -- all -m ${{ matrix.ruleset.id }} -ac -c ${{ env.CONCURRENCY }}
+      - name: Run diffcalc (pr)
+        env:
+          DB_NAME: osu_pr
+        run: |
+          cd $GITHUB_WORKSPACE/pr/osu-difficulty-calculator/osu.Server.DifficultyCalculator
+          dotnet run -c:Release -- all -m ${{ matrix.ruleset.id }} -ac -c ${{ env.CONCURRENCY }}
+
+      - name: Print diffs
+        run: |
+          mysql -e "
+            SELECT
+              m.beatmap_id,
+              m.mods,
+              b.filename,
+              m.diff_unified as 'sr_master',
+              p.diff_unified as 'sr_pr',
+              (p.diff_unified - m.diff_unified) as 'diff'
+            FROM osu_master.osu_beatmap_difficulty m
+            JOIN osu_pr.osu_beatmap_difficulty p
+              ON m.beatmap_id = p.beatmap_id
+              AND m.mode = p.mode
+              AND m.mods = p.mods
+            JOIN osu_pr.osu_beatmaps b
+              ON b.beatmap_id = p.beatmap_id
+            WHERE abs(m.diff_unified - p.diff_unified) > 0.1
+            ORDER BY abs(m.diff_unified - p.diff_unified)
+              DESC
+            LIMIT 10000;"
+
+      # Todo: Run ppcalc

.github/workflows/report-nunit.yml

@@ -30,3 +30,5 @@ jobs:
           name: Test Results (${{matrix.os.prettyname}}, ${{matrix.threadingMode}})
           path: "*.trx"
           reporter: dotnet-trx
+          list-suites: 'failed'
+          list-tests: 'failed'

.idea/.idea.osu.Desktop/.idea/runConfigurations/Benchmarks.xml

@@ -1,8 +1,8 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="Benchmarks" type="DotNetProject" factoryName=".NET Project">
-    <option name="EXE_PATH" value="$PROJECT_DIR$/osu.Game.Benchmarks/bin/Release/net5.0/osu.Game.Benchmarks.dll" />
-    <option name="PROGRAM_PARAMETERS" value="--filter *" />
-    <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$/osu.Game.Benchmarks/bin/Release/net5.0" />
+    <option name="EXE_PATH" value="$PROJECT_DIR$/osu.Game.Benchmarks/bin/Debug/net5.0/osu.Game.Benchmarks.dll" />
+    <option name="PROGRAM_PARAMETERS" value="" />
+    <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$/osu.Game.Benchmarks/bin/Debug/net5.0" />
     <option name="PASS_PARENT_ENVS" value="1" />
     <option name="USE_EXTERNAL_CONSOLE" value="0" />
     <option name="USE_MONO" value="0" />
@@ -14,7 +14,7 @@
     <option name="PROJECT_KIND" value="DotNetCore" />
     <option name="PROJECT_TFM" value="net5.0" />
     <method v="2">
-      <option name="Build" enabled="true" />
+      <option name="Build" />
     </method>
   </configuration>
 </component>

.idea/.idea.osu/.idea/indexLayout.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ContentModelUserStore">
+  <component name="UserContentModel">
     <attachedFolders />
     <explicitIncludes />
     <explicitExcludes />

.run/Dual client test.run.xml

@@ -0,0 +1,7 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Dual client test" type="CompoundRunConfigurationType">
+    <toRun name="osu!" type="DotNetProject" />
+    <toRun name="osu! (Second Client)" type="DotNetProject" />
+    <method v="2" />
+  </configuration>
+</component>

.run/osu! (Second Client).run.xml

@@ -0,0 +1,20 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="osu! (Second Client)" type="DotNetProject" factoryName=".NET Project" folderName="osu!" activateToolWindowBeforeRun="false">
+    <option name="EXE_PATH" value="$PROJECT_DIR$/osu.Desktop/bin/Debug/net5.0/osu!.dll" />
+    <option name="PROGRAM_PARAMETERS" value="--debug-client-id=1" />
+    <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$/osu.Desktop/bin/Debug/net5.0" />
+    <option name="PASS_PARENT_ENVS" value="1" />
+    <option name="USE_EXTERNAL_CONSOLE" value="0" />
+    <option name="USE_MONO" value="0" />
+    <option name="RUNTIME_ARGUMENTS" value="" />
+    <option name="PROJECT_PATH" value="$PROJECT_DIR$/osu.Desktop/osu.Desktop.csproj" />
+    <option name="PROJECT_EXE_PATH_TRACKING" value="1" />
+    <option name="PROJECT_ARGUMENTS_TRACKING" value="1" />
+    <option name="PROJECT_WORKING_DIRECTORY_TRACKING" value="1" />
+    <option name="PROJECT_KIND" value="DotNetCore" />
+    <option name="PROJECT_TFM" value="net5.0" />
+    <method v="2">
+      <option name="Build" />
+    </method>
+  </configuration>
+</component>

Directory.Build.props

@@ -16,7 +16,7 @@
     <EmbeddedResource Include="Resources\**\*.*" />
   </ItemGroup>
   <ItemGroup Label="Code Analysis">
-    <PackageReference Include="Microsoft.CodeAnalysis.BannedApiAnalyzers" Version="3.3.2" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.CodeAnalysis.BannedApiAnalyzers" Version="3.3.3" PrivateAssets="All" />
     <AdditionalFiles Include="$(MSBuildThisFileDirectory)CodeAnalysis\BannedSymbols.txt" />
     <PackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="5.0.3" PrivateAssets="All" />
   </ItemGroup>

README.md

@@ -4,7 +4,7 @@
 
 # osu!
 
-[![Build status](https://ci.appveyor.com/api/projects/status/u2p01nx7l6og8buh?svg=true)](https://ci.appveyor.com/project/peppy/osu)
+[![Build status](https://github.com/ppy/osu/actions/workflows/ci.yml/badge.svg?branch=master&event=push)](https://github.com/ppy/osu/actions/workflows/ci.yml)
 [![GitHub release](https://img.shields.io/github/release/ppy/osu.svg)](https://github.com/ppy/osu/releases/latest)
 [![CodeFactor](https://www.codefactor.io/repository/github/ppy/osu/badge)](https://www.codefactor.io/repository/github/ppy/osu)
 [![dev chat](https://discordapp.com/api/guilds/188630481301012481/widget.png?style=shield)](https://discord.gg/ppy)
@@ -31,12 +31,11 @@ If you are looking to install or test osu! without setting up a development envi
 
 **Latest build:**
 
-| [Windows (x64)](https://github.com/ppy/osu/releases/latest/download/install.exe)  | [macOS 10.12+](https://github.com/ppy/osu/releases/latest/download/osu.app.zip) | [Linux (x64)](https://github.com/ppy/osu/releases/latest/download/osu.AppImage) | [iOS(iOS 10+)](https://osu.ppy.sh/home/testflight) | [Android (5+)](https://github.com/ppy/osu/releases/latest/download/sh.ppy.osulazer.apk)
+| [Windows 8.1+ (x64)](https://github.com/ppy/osu/releases/latest/download/install.exe) | [macOS 10.12+](https://github.com/ppy/osu/releases/latest/download/osu.app.zip) | [Linux (x64)](https://github.com/ppy/osu/releases/latest/download/osu.AppImage) | [iOS 10+](https://osu.ppy.sh/home/testflight) | [Android 5+](https://github.com/ppy/osu/releases/latest/download/sh.ppy.osulazer.apk)
 | ------------- | ------------- | ------------- | ------------- | ------------- |
 
 - The iOS testflight link may fill up (Apple has a hard limit of 10,000 users). We reset it occasionally when this happens. Please do not ask about this. Check back regularly for link resets or follow [peppy](https://twitter.com/ppy) on twitter for announcements of link resets.
 
-- When running on Windows 7 or 8.1, *[additional prerequisites](https://docs.microsoft.com/en-us/dotnet/core/install/windows?tabs=net50&pivots=os-windows#dependencies)** may be required to correctly run .NET 5 applications if your operating system is not up-to-date with the latest service packs.
 If your platform is not listed above, there is still a chance you can manually build it by following the instructions below.
 
 ## Developing a custom ruleset

Templates/Rulesets/ruleset-empty/osu.Game.Rulesets.EmptyFreeform.Tests/TestSceneOsuGame.cs

@@ -15,9 +15,6 @@ namespace osu.Game.Rulesets.EmptyFreeform.Tests
         [BackgroundDependencyLoader]
         private void load(GameHost host, OsuGameBase gameBase)
         {
-            OsuGame game = new OsuGame();
-            game.SetHost(host);
-
             Children = new Drawable[]
             {
                 new Box
@@ -25,8 +22,9 @@ namespace osu.Game.Rulesets.EmptyFreeform.Tests
                     RelativeSizeAxes = Axes.Both,
                     Colour = Color4.Black,
                 },
-                game
             };
+
+            AddGame(new OsuGame());
         }
     }
 }

Templates/Rulesets/ruleset-empty/osu.Game.Rulesets.EmptyFreeform.Tests/osu.Game.Rulesets.EmptyFreeform.Tests.csproj

@@ -10,7 +10,7 @@
     </PropertyGroup>
   <ItemGroup Label="Package References">
     <PackageReference Include="Appveyor.TestLogger" Version="2.0.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.10.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.0.0" />
     <PackageReference Include="NUnit" Version="3.13.2" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.0.0" />
     <PackageReference Update="Microsoft.EntityFrameworkCore.Sqlite" Version="2.1.4" />

Templates/Rulesets/ruleset-empty/osu.Game.Rulesets.EmptyFreeform/Mods/EmptyFreeformModAutoplay.cs

@@ -3,10 +3,10 @@
 
 using System.Collections.Generic;
 using osu.Game.Beatmaps;
+using osu.Game.Online.API.Requests.Responses;
 using osu.Game.Rulesets.EmptyFreeform.Replays;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Scoring;
-using osu.Game.Users;
 
 namespace osu.Game.Rulesets.EmptyFreeform.Mods
 {
@@ -16,7 +16,7 @@ namespace osu.Game.Rulesets.EmptyFreeform.Mods
         {
             ScoreInfo = new ScoreInfo
             {
-                User = new User { Username = "sample" },
+                User = new APIUser { Username = "sample" },
             },
             Replay = new EmptyFreeformAutoGenerator(beatmap).Generate(),
         };

Templates/Rulesets/ruleset-example/osu.Game.Rulesets.Pippidon.Tests/TestSceneOsuGame.cs

@@ -15,9 +15,6 @@ namespace osu.Game.Rulesets.Pippidon.Tests
         [BackgroundDependencyLoader]
         private void load(GameHost host, OsuGameBase gameBase)
         {
-            OsuGame game = new OsuGame();
-            game.SetHost(host);
-
             Children = new Drawable[]
             {
                 new Box
@@ -25,8 +22,9 @@ namespace osu.Game.Rulesets.Pippidon.Tests
                     RelativeSizeAxes = Axes.Both,
                     Colour = Color4.Black,
                 },
-                game
             };
+
+            AddGame(new OsuGame());
         }
     }
 }

Templates/Rulesets/ruleset-example/osu.Game.Rulesets.Pippidon.Tests/osu.Game.Rulesets.Pippidon.Tests.csproj

@@ -10,7 +10,7 @@
   </PropertyGroup>
   <ItemGroup Label="Package References">
     <PackageReference Include="Appveyor.TestLogger" Version="2.0.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.10.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.0.0" />
     <PackageReference Include="NUnit" Version="3.13.2" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.0.0" />
     <PackageReference Update="Microsoft.EntityFrameworkCore.Sqlite" Version="2.1.4" />

Templates/Rulesets/ruleset-example/osu.Game.Rulesets.Pippidon/Mods/PippidonModAutoplay.cs

@@ -3,10 +3,10 @@
 
 using System.Collections.Generic;
 using osu.Game.Beatmaps;
+using osu.Game.Online.API.Requests.Responses;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Pippidon.Replays;
 using osu.Game.Scoring;
-using osu.Game.Users;
 
 namespace osu.Game.Rulesets.Pippidon.Mods
 {
@@ -16,7 +16,7 @@ namespace osu.Game.Rulesets.Pippidon.Mods
         {
             ScoreInfo = new ScoreInfo
             {
-                User = new User { Username = "sample" },
+                User = new APIUser { Username = "sample" },
             },
             Replay = new PippidonAutoGenerator(beatmap).Generate(),
         };

Templates/Rulesets/ruleset-scrolling-empty/osu.Game.Rulesets.EmptyScrolling.Tests/TestSceneOsuGame.cs

@@ -15,9 +15,6 @@ namespace osu.Game.Rulesets.EmptyScrolling.Tests
         [BackgroundDependencyLoader]
         private void load(GameHost host, OsuGameBase gameBase)
         {
-            OsuGame game = new OsuGame();
-            game.SetHost(host);
-
             Children = new Drawable[]
             {
                 new Box
@@ -25,8 +22,9 @@ namespace osu.Game.Rulesets.EmptyScrolling.Tests
                     RelativeSizeAxes = Axes.Both,
                     Colour = Color4.Black,
                 },
-                game
             };
+
+            AddGame(new OsuGame());
         }
     }
 }

Templates/Rulesets/ruleset-scrolling-empty/osu.Game.Rulesets.EmptyScrolling.Tests/osu.Game.Rulesets.EmptyScrolling.Tests.csproj

@@ -10,7 +10,7 @@
   </PropertyGroup>
   <ItemGroup Label="Package References">
     <PackageReference Include="Appveyor.TestLogger" Version="2.0.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.10.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.0.0" />
     <PackageReference Include="NUnit" Version="3.13.2" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.0.0" />
     <PackageReference Update="Microsoft.EntityFrameworkCore.Sqlite" Version="2.1.4" />

Templates/Rulesets/ruleset-scrolling-empty/osu.Game.Rulesets.EmptyScrolling/Mods/EmptyScrollingModAutoplay.cs

@@ -5,8 +5,8 @@ using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.EmptyScrolling.Replays;
 using osu.Game.Scoring;
-using osu.Game.Users;
 using System.Collections.Generic;
+using osu.Game.Online.API.Requests.Responses;
 
 namespace osu.Game.Rulesets.EmptyScrolling.Mods
 {
@@ -16,7 +16,7 @@ namespace osu.Game.Rulesets.EmptyScrolling.Mods
         {
             ScoreInfo = new ScoreInfo
             {
-                User = new User { Username = "sample" },
+                User = new APIUser { Username = "sample" },
             },
             Replay = new EmptyScrollingAutoGenerator(beatmap).Generate(),
         };

Templates/Rulesets/ruleset-scrolling-example/osu.Game.Rulesets.Pippidon.Tests/TestSceneOsuGame.cs

@@ -15,9 +15,6 @@ namespace osu.Game.Rulesets.Pippidon.Tests
         [BackgroundDependencyLoader]
         private void load(GameHost host, OsuGameBase gameBase)
         {
-            OsuGame game = new OsuGame();
-            game.SetHost(host);
-
             Children = new Drawable[]
             {
                 new Box
@@ -25,8 +22,9 @@ namespace osu.Game.Rulesets.Pippidon.Tests
                     RelativeSizeAxes = Axes.Both,
                     Colour = Color4.Black,
                 },
-                game
             };
+
+            AddGame(new OsuGame());
         }
     }
 }

Templates/Rulesets/ruleset-scrolling-example/osu.Game.Rulesets.Pippidon.Tests/osu.Game.Rulesets.Pippidon.Tests.csproj

@@ -10,7 +10,7 @@
   </PropertyGroup>
   <ItemGroup Label="Package References">
     <PackageReference Include="Appveyor.TestLogger" Version="2.0.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.10.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.0.0" />
     <PackageReference Include="NUnit" Version="3.13.2" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.0.0" />
     <PackageReference Update="Microsoft.EntityFrameworkCore.Sqlite" Version="2.1.4" />

Templates/Rulesets/ruleset-scrolling-example/osu.Game.Rulesets.Pippidon/Mods/PippidonModAutoplay.cs

@@ -3,10 +3,10 @@
 
 using System.Collections.Generic;
 using osu.Game.Beatmaps;
+using osu.Game.Online.API.Requests.Responses;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Pippidon.Replays;
 using osu.Game.Scoring;
-using osu.Game.Users;
 
 namespace osu.Game.Rulesets.Pippidon.Mods
 {
@@ -16,7 +16,7 @@ namespace osu.Game.Rulesets.Pippidon.Mods
         {
             ScoreInfo = new ScoreInfo
             {
-                User = new User { Username = "sample" },
+                User = new APIUser { Username = "sample" },
             },
             Replay = new PippidonAutoGenerator(beatmap).Generate(),
         };

Templates/Rulesets/ruleset-scrolling-example/osu.Game.Rulesets.Pippidon/UI/PippidonCharacter.cs

@@ -8,6 +8,7 @@ using osu.Framework.Graphics;
 using osu.Framework.Graphics.Sprites;
 using osu.Framework.Graphics.Textures;
 using osu.Framework.Input.Bindings;
+using osu.Framework.Input.Events;
 using osu.Game.Beatmaps.ControlPoints;
 using osu.Game.Graphics.Containers;
 using osuTK;
@@ -61,9 +62,9 @@ namespace osu.Game.Rulesets.Pippidon.UI
             }
         }
 
-        public bool OnPressed(PippidonAction action)
+        public bool OnPressed(KeyBindingPressEvent<PippidonAction> e)
         {
-            switch (action)
+            switch (e.Action)
             {
                 case PippidonAction.MoveUp:
                     changeLane(-1);
@@ -78,7 +79,7 @@ namespace osu.Game.Rulesets.Pippidon.UI
             }
         }
 
-        public void OnReleased(PippidonAction action)
+        public void OnReleased(KeyBindingReleaseEvent<PippidonAction> e)
         {
         }
 

osu.Android.props

@@ -51,11 +51,11 @@
     <Reference Include="Java.Interop" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="ppy.osu.Game.Resources" Version="2021.706.0" />
-    <PackageReference Include="ppy.osu.Framework.Android" Version="2021.714.0" />
+    <PackageReference Include="ppy.osu.Game.Resources" Version="2021.1112.0" />
+    <PackageReference Include="ppy.osu.Framework.Android" Version="2021.1108.0" />
   </ItemGroup>
   <ItemGroup Label="Transitive Dependencies">
     <!-- Realm needs to be directly referenced in all Xamarin projects, as it will not pull in its transitive dependencies otherwise. -->
-    <PackageReference Include="Realm" Version="10.3.0" />
+    <PackageReference Include="Realm" Version="10.6.0" />
   </ItemGroup>
 </Project>

osu.Android/OsuGameActivity.cs

@@ -20,8 +20,22 @@ namespace osu.Android
     [Activity(Theme = "@android:style/Theme.NoTitleBar", MainLauncher = true, ScreenOrientation = ScreenOrientation.FullUser, SupportsPictureInPicture = false, ConfigurationChanges = ConfigChanges.Orientation | ConfigChanges.ScreenSize, HardwareAccelerated = false, LaunchMode = LaunchMode.SingleInstance, Exported = true)]
     [IntentFilter(new[] { Intent.ActionView }, Categories = new[] { Intent.CategoryDefault }, DataScheme = "content", DataPathPattern = ".*\\\\.osz", DataHost = "*", DataMimeType = "*/*")]
     [IntentFilter(new[] { Intent.ActionView }, Categories = new[] { Intent.CategoryDefault }, DataScheme = "content", DataPathPattern = ".*\\\\.osk", DataHost = "*", DataMimeType = "*/*")]
-    [IntentFilter(new[] { Intent.ActionView }, Categories = new[] { Intent.CategoryDefault }, DataScheme = "content", DataMimeType = "application/x-osu-archive")]
-    [IntentFilter(new[] { Intent.ActionSend, Intent.ActionSendMultiple }, Categories = new[] { Intent.CategoryDefault }, DataMimeTypes = new[] { "application/zip", "application/octet-stream", "application/download", "application/x-zip", "application/x-zip-compressed", "application/x-osu-archive" })]
+    [IntentFilter(new[] { Intent.ActionView }, Categories = new[] { Intent.CategoryDefault }, DataScheme = "content", DataPathPattern = ".*\\\\.osr", DataHost = "*", DataMimeType = "*/*")]
+    [IntentFilter(new[] { Intent.ActionView }, Categories = new[] { Intent.CategoryDefault }, DataScheme = "content", DataMimeType = "application/x-osu-beatmap-archive")]
+    [IntentFilter(new[] { Intent.ActionView }, Categories = new[] { Intent.CategoryDefault }, DataScheme = "content", DataMimeType = "application/x-osu-skin-archive")]
+    [IntentFilter(new[] { Intent.ActionView }, Categories = new[] { Intent.CategoryDefault }, DataScheme = "content", DataMimeType = "application/x-osu-replay")]
+    [IntentFilter(new[] { Intent.ActionSend, Intent.ActionSendMultiple }, Categories = new[] { Intent.CategoryDefault }, DataMimeTypes = new[]
+    {
+        "application/zip",
+        "application/octet-stream",
+        "application/download",
+        "application/x-zip",
+        "application/x-zip-compressed",
+        // newer official mime types (see https://osu.ppy.sh/wiki/en/osu%21_File_Formats).
+        "application/x-osu-beatmap-archive",
+        "application/x-osu-skin-archive",
+        "application/x-osu-replay",
+    })]
     [IntentFilter(new[] { Intent.ActionView }, Categories = new[] { Intent.CategoryBrowsable, Intent.CategoryDefault }, DataSchemes = new[] { "osu", "osump" })]
     public class OsuGameActivity : AndroidGameActivity
     {
@@ -66,12 +80,14 @@ namespace osu.Android
                 case Intent.ActionSendMultiple:
                 {
                     var uris = new List<Uri>();
+
                     for (int i = 0; i < intent.ClipData?.ItemCount; i++)
                     {
                         var content = intent.ClipData?.GetItemAt(i);
                         if (content != null)
                             uris.Add(content.Uri);
                     }
+
                     handleImportFromUris(uris.ToArray());
                     break;
                 }

osu.Android/osu.Android.csproj

@@ -64,7 +64,7 @@
     </PackageReference>
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Xamarin.Essentials" Version="1.6.1" />
+    <PackageReference Include="Xamarin.Essentials" Version="1.7.0" />
   </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
 </Project>

osu.Desktop/DiscordRichPresence.cs

@@ -11,10 +11,10 @@ using osu.Framework.Graphics;
 using osu.Framework.Logging;
 using osu.Game.Configuration;
 using osu.Game.Online.API;
+using osu.Game.Online.API.Requests.Responses;
 using osu.Game.Rulesets;
 using osu.Game.Users;
 using LogLevel = osu.Framework.Logging.LogLevel;
-using User = osu.Game.Users.User;
 
 namespace osu.Desktop
 {
@@ -27,7 +27,7 @@ namespace osu.Desktop
         [Resolved]
         private IBindable<RulesetInfo> ruleset { get; set; }
 
-        private IBindable<User> user;
+        private IBindable<APIUser> user;
 
         private readonly IBindable<UserStatus> status = new Bindable<UserStatus>();
         private readonly IBindable<UserActivity> activity = new Bindable<UserActivity>();
@@ -139,11 +139,11 @@ namespace osu.Desktop
         {
             switch (activity)
             {
-                case UserActivity.SoloGame solo:
-                    return solo.Beatmap.ToString();
+                case UserActivity.InGame game:
+                    return game.BeatmapInfo.ToString();
 
                 case UserActivity.Editing edit:
-                    return edit.Beatmap.ToString();
+                    return edit.BeatmapInfo.ToString();
 
                 case UserActivity.InLobby lobby:
                     return privacyMode.Value == DiscordRichPresenceMode.Limited ? string.Empty : lobby.Room.Name.Value;

osu.Desktop/OsuGameDesktop.cs

@@ -156,7 +156,7 @@ namespace osu.Desktop
         {
             lock (importableFiles)
             {
-                var firstExtension = Path.GetExtension(filePaths.First());
+                string firstExtension = Path.GetExtension(filePaths.First());
 
                 if (filePaths.Any(f => Path.GetExtension(f) != firstExtension)) return;
 
@@ -177,7 +177,7 @@ namespace osu.Desktop
             {
                 Logger.Log($"Handling batch import of {importableFiles.Count} files");
 
-                var paths = importableFiles.ToArray();
+                string[] paths = importableFiles.ToArray();
                 importableFiles.Clear();
 
                 Task.Factory.StartNew(() => Import(paths), TaskCreationOptions.LongRunning);

osu.Desktop/Program.cs

@@ -3,7 +3,6 @@
 
 using System;
 using System.IO;
-using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using osu.Framework;
@@ -17,13 +16,43 @@ namespace osu.Desktop
 {
     public static class Program
     {
+        private const string base_game_name = @"osu";
+
         [STAThread]
         public static int Main(string[] args)
         {
             // Back up the cwd before DesktopGameHost changes it
-            var cwd = Environment.CurrentDirectory;
+            string cwd = Environment.CurrentDirectory;
 
-            using (DesktopGameHost host = Host.GetSuitableHost(@"osu", true))
+            string gameName = base_game_name;
+            bool tournamentClient = false;
+
+            foreach (string arg in args)
+            {
+                string[] split = arg.Split('=');
+
+                string key = split[0];
+                string val = split.Length > 1 ? split[1] : string.Empty;
+
+                switch (key)
+                {
+                    case "--tournament":
+                        tournamentClient = true;
+                        break;
+
+                    case "--debug-client-id":
+                        if (!DebugUtils.IsDebugBuild)
+                            throw new InvalidOperationException("Cannot use this argument in a non-debug build.");
+
+                        if (!int.TryParse(val, out int clientID))
+                            throw new ArgumentException("Provided client ID must be an integer.");
+
+                        gameName = $"{base_game_name}-{clientID}";
+                        break;
+                }
+            }
+
+            using (DesktopGameHost host = Host.GetSuitableHost(gameName, true))
             {
                 host.ExceptionThrown += handleException;
 
@@ -33,7 +62,7 @@ namespace osu.Desktop
                     {
                         var importer = new ArchiveImportIPCChannel(host);
 
-                        foreach (var file in args)
+                        foreach (string file in args)
                         {
                             Console.WriteLine(@"Importing {0}", file);
                             if (!importer.ImportAsync(Path.GetFullPath(file, cwd)).Wait(3000))
@@ -45,19 +74,16 @@ namespace osu.Desktop
 
                     // we want to allow multiple instances to be started when in debug.
                     if (!DebugUtils.IsDebugBuild)
+                    {
+                        Logger.Log(@"osu! does not support multiple running instances.", LoggingTarget.Runtime, LogLevel.Error);
                         return 0;
+                    }
                 }
 
-                switch (args.FirstOrDefault() ?? string.Empty)
-                {
-                    default:
-                        host.Run(new OsuGameDesktop(args));
-                        break;
-
-                    case "--tournament":
-                        host.Run(new TournamentGame());
-                        break;
-                }
+                if (tournamentClient)
+                    host.Run(new TournamentGame());
+                else
+                    host.Run(new OsuGameDesktop(args));
 
                 return 0;
             }

osu.Desktop/Windows/GameplayWinKeyBlocker.cs

@@ -5,23 +5,23 @@ using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Platform;
-using osu.Game;
 using osu.Game.Configuration;
+using osu.Game.Screens.Play;
 
 namespace osu.Desktop.Windows
 {
     public class GameplayWinKeyBlocker : Component
     {
         private Bindable<bool> disableWinKey;
-        private Bindable<bool> localUserPlaying;
+        private IBindable<bool> localUserPlaying;
 
         [Resolved]
         private GameHost host { get; set; }
 
         [BackgroundDependencyLoader]
-        private void load(OsuGame game, OsuConfigManager config)
+        private void load(ILocalUserPlayInfo localUserInfo, OsuConfigManager config)
         {
-            localUserPlaying = game.LocalUserPlaying.GetBoundCopy();
+            localUserPlaying = localUserInfo.IsPlaying.GetBoundCopy();
             localUserPlaying.BindValueChanged(_ => updateBlocking());
 
             disableWinKey = config.GetBindable<bool>(OsuSetting.GameplayDisableWinKey);

osu.Game.Benchmarks/BenchmarkMod.cs

@@ -0,0 +1,34 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using BenchmarkDotNet.Attributes;
+using osu.Game.Rulesets.Osu.Mods;
+
+namespace osu.Game.Benchmarks
+{
+    public class BenchmarkMod : BenchmarkTest
+    {
+        private OsuModDoubleTime mod;
+
+        [Params(1, 10, 100)]
+        public int Times { get; set; }
+
+        public override void SetUp()
+        {
+            base.SetUp();
+            mod = new OsuModDoubleTime();
+        }
+
+        [Benchmark]
+        public int ModHashCode()
+        {
+            var hashCode = new HashCode();
+
+            for (int i = 0; i < Times; i++)
+                hashCode.Add(mod);
+
+            return hashCode.ToHashCode();
+        }
+    }
+}

osu.Game.Benchmarks/BenchmarkRuleset.cs

@@ -0,0 +1,62 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Engines;
+using osu.Game.Online.API;
+using osu.Game.Rulesets.Mods;
+using osu.Game.Rulesets.Osu;
+
+namespace osu.Game.Benchmarks
+{
+    public class BenchmarkRuleset : BenchmarkTest
+    {
+        private OsuRuleset ruleset;
+        private APIMod apiModDoubleTime;
+        private APIMod apiModDifficultyAdjust;
+
+        public override void SetUp()
+        {
+            base.SetUp();
+            ruleset = new OsuRuleset();
+            apiModDoubleTime = new APIMod { Acronym = "DT" };
+            apiModDifficultyAdjust = new APIMod { Acronym = "DA" };
+        }
+
+        [Benchmark]
+        public void BenchmarkToModDoubleTime()
+        {
+            apiModDoubleTime.ToMod(ruleset);
+        }
+
+        [Benchmark]
+        public void BenchmarkToModDifficultyAdjust()
+        {
+            apiModDifficultyAdjust.ToMod(ruleset);
+        }
+
+        [Benchmark]
+        public void BenchmarkGetAllMods()
+        {
+            ruleset.CreateAllMods().Consume(new Consumer());
+        }
+
+        [Benchmark]
+        public void BenchmarkGetAllModsForReference()
+        {
+            ruleset.AllMods.Consume(new Consumer());
+        }
+
+        [Benchmark]
+        public void BenchmarkGetForAcronym()
+        {
+            ruleset.CreateModFromAcronym("DT");
+        }
+
+        [Benchmark]
+        public void BenchmarkGetForType()
+        {
+            ruleset.CreateMod<ModDoubleTime>();
+        }
+    }
+}

osu.Game.Benchmarks/Program.cs

@@ -1,6 +1,7 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using BenchmarkDotNet.Configs;
 using BenchmarkDotNet.Running;
 
 namespace osu.Game.Benchmarks
@@ -11,7 +12,7 @@ namespace osu.Game.Benchmarks
         {
             BenchmarkSwitcher
                 .FromAssembly(typeof(Program).Assembly)
-                .Run(args);
+                .Run(args, DefaultConfig.Instance.WithOption(ConfigOptions.DisableOptimizationsValidator, true));
         }
     }
 }

osu.Game.Benchmarks/osu.Game.Benchmarks.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="BenchmarkDotNet" Version="0.13.0" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.13.1" />
     <PackageReference Include="nunit" Version="3.13.2" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.0.0" />
   </ItemGroup>

osu.Game.Rulesets.Catch.Tests/CatchDifficultyCalculatorTest.cs

@@ -14,11 +14,11 @@ namespace osu.Game.Rulesets.Catch.Tests
     {
         protected override string ResourceAssembly => "osu.Game.Rulesets.Catch";
 
-        [TestCase(4.050601681491468d, "diffcalc-test")]
+        [TestCase(4.0505463516206195d, "diffcalc-test")]
         public void Test(double expected, string name)
             => base.Test(expected, name);
 
-        [TestCase(5.169743871843191d, "diffcalc-test")]
+        [TestCase(5.1696411260785498d, "diffcalc-test")]
         public void TestClockRateAdjusted(double expected, string name)
             => Test(expected, name, new CatchModDoubleTime());
 

osu.Game.Rulesets.Catch.Tests/Editor/CatchSelectionBlueprintTestScene.cs

@@ -1,10 +1,17 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Rulesets.Catch.Beatmaps;
+using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.UI.Scrolling;
+using osu.Game.Screens.Edit;
 using osu.Game.Tests.Visual;
+using osuTK;
 
 namespace osu.Game.Rulesets.Catch.Tests.Editor
 {
@@ -14,11 +21,51 @@ namespace osu.Game.Rulesets.Catch.Tests.Editor
 
         protected override Container<Drawable> Content => contentContainer;
 
+        [Cached(typeof(EditorBeatmap))]
+        [Cached(typeof(IBeatSnapProvider))]
+        protected readonly EditorBeatmap EditorBeatmap;
+
         private readonly CatchEditorTestSceneContainer contentContainer;
 
         protected CatchSelectionBlueprintTestScene()
         {
-            base.Content.Add(contentContainer = new CatchEditorTestSceneContainer());
+            EditorBeatmap = new EditorBeatmap(new CatchBeatmap()) { Difficulty = { CircleSize = 0 } };
+            EditorBeatmap.ControlPointInfo.Add(0, new TimingControlPoint
+            {
+                BeatLength = 100
+            });
+
+            base.Content.Add(new EditorBeatmapDependencyContainer(EditorBeatmap, new BindableBeatDivisor())
+            {
+                RelativeSizeAxes = Axes.Both,
+                Children = new Drawable[]
+                {
+                    EditorBeatmap,
+                    contentContainer = new CatchEditorTestSceneContainer()
+                },
+            });
+        }
+
+        protected void AddMouseMoveStep(double time, float x) => AddStep($"move to time={time}, x={x}", () =>
+        {
+            float y = HitObjectContainer.PositionAtTime(time);
+            Vector2 pos = HitObjectContainer.ToScreenSpace(new Vector2(x, y + HitObjectContainer.DrawHeight));
+            InputManager.MoveMouseTo(pos);
+        });
+
+        private class EditorBeatmapDependencyContainer : Container
+        {
+            [Cached]
+            private readonly EditorClock editorClock;
+
+            [Cached]
+            private readonly BindableBeatDivisor beatDivisor;
+
+            public EditorBeatmapDependencyContainer(IBeatmap beatmap, BindableBeatDivisor beatDivisor)
+            {
+                editorClock = new EditorClock(beatmap, beatDivisor);
+                this.beatDivisor = beatDivisor;
+            }
         }
     }
 }

osu.Game.Rulesets.Catch.Tests/Editor/Checks/TestCheckBananaShowerGap.cs

@@ -0,0 +1,118 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Catch.Edit.Checks;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Tests.Beatmaps;
+
+namespace osu.Game.Rulesets.Catch.Tests.Editor.Checks
+{
+    [TestFixture]
+    public class TestCheckBananaShowerGap
+    {
+        private CheckBananaShowerGap check;
+
+        [SetUp]
+        public void Setup()
+        {
+            check = new CheckBananaShowerGap();
+        }
+
+        [Test]
+        public void TestAllowedSpinnerGaps()
+        {
+            assertOk(mockBeatmap(250, 1000, 1250), DifficultyRating.Easy);
+            assertOk(mockBeatmap(250, 1000, 1250), DifficultyRating.Normal);
+            assertOk(mockBeatmap(125, 1000, 1250), DifficultyRating.Hard);
+            assertOk(mockBeatmap(125, 1000, 1125), DifficultyRating.Insane);
+            assertOk(mockBeatmap(62, 1000, 1125), DifficultyRating.Expert);
+            assertOk(mockBeatmap(62, 1000, 1125), DifficultyRating.ExpertPlus);
+        }
+
+        [Test]
+        public void TestDisallowedSpinnerGapStart()
+        {
+            assertTooShortSpinnerStart(mockBeatmap(249, 1000, 1250), DifficultyRating.Easy);
+            assertTooShortSpinnerStart(mockBeatmap(249, 1000, 1250), DifficultyRating.Normal);
+            assertTooShortSpinnerStart(mockBeatmap(124, 1000, 1250), DifficultyRating.Hard);
+            assertTooShortSpinnerStart(mockBeatmap(124, 1000, 1250), DifficultyRating.Insane);
+            assertTooShortSpinnerStart(mockBeatmap(61, 1000, 1250), DifficultyRating.Expert);
+            assertTooShortSpinnerStart(mockBeatmap(61, 1000, 1250), DifficultyRating.ExpertPlus);
+        }
+
+        [Test]
+        public void TestDisallowedSpinnerGapEnd()
+        {
+            assertTooShortSpinnerEnd(mockBeatmap(250, 1000, 1249), DifficultyRating.Easy);
+            assertTooShortSpinnerEnd(mockBeatmap(250, 1000, 1249), DifficultyRating.Normal);
+            assertTooShortSpinnerEnd(mockBeatmap(125, 1000, 1249), DifficultyRating.Hard);
+            assertTooShortSpinnerEnd(mockBeatmap(125, 1000, 1124), DifficultyRating.Insane);
+            assertTooShortSpinnerEnd(mockBeatmap(62, 1000, 1124), DifficultyRating.Expert);
+            assertTooShortSpinnerEnd(mockBeatmap(62, 1000, 1124), DifficultyRating.ExpertPlus);
+        }
+
+        [Test]
+        public void TestConsecutiveSpinners()
+        {
+            var spinnerConsecutiveBeatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new BananaShower { StartTime = 0, EndTime = 100, X = 0 },
+                    new BananaShower { StartTime = 101, EndTime = 200, X = 0 },
+                    new BananaShower { StartTime = 201, EndTime = 300, X = 0 }
+                }
+            };
+
+            assertOk(spinnerConsecutiveBeatmap, DifficultyRating.Easy);
+            assertOk(spinnerConsecutiveBeatmap, DifficultyRating.Normal);
+            assertOk(spinnerConsecutiveBeatmap, DifficultyRating.Hard);
+            assertOk(spinnerConsecutiveBeatmap, DifficultyRating.Insane);
+            assertOk(spinnerConsecutiveBeatmap, DifficultyRating.Expert);
+            assertOk(spinnerConsecutiveBeatmap, DifficultyRating.ExpertPlus);
+        }
+
+        private Beatmap<HitObject> mockBeatmap(double bananaShowerStart, double bananaShowerEnd, double nextFruitStart)
+        {
+            return new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new Fruit { StartTime = 0, X = 0 },
+                    new BananaShower { StartTime = bananaShowerStart, EndTime = bananaShowerEnd, X = 0 },
+                    new Fruit { StartTime = nextFruitStart, X = 0 }
+                }
+            };
+        }
+
+        private void assertOk(IBeatmap beatmap, DifficultyRating difficultyRating)
+        {
+            var context = new BeatmapVerifierContext(beatmap, new TestWorkingBeatmap(beatmap), difficultyRating);
+            Assert.That(check.Run(context), Is.Empty);
+        }
+
+        private void assertTooShortSpinnerStart(IBeatmap beatmap, DifficultyRating difficultyRating)
+        {
+            var context = new BeatmapVerifierContext(beatmap, new TestWorkingBeatmap(beatmap), difficultyRating);
+            var issues = check.Run(context).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(1));
+            Assert.That(issues.All(issue => issue.Template is CheckBananaShowerGap.IssueTemplateBananaShowerStartGap));
+        }
+
+        private void assertTooShortSpinnerEnd(IBeatmap beatmap, DifficultyRating difficultyRating)
+        {
+            var context = new BeatmapVerifierContext(beatmap, new TestWorkingBeatmap(beatmap), difficultyRating);
+            var issues = check.Run(context).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(1));
+            Assert.That(issues.All(issue => issue.Template is CheckBananaShowerGap.IssueTemplateBananaShowerEndGap));
+        }
+    }
+}

osu.Game.Rulesets.Catch.Tests/Editor/TestSceneBananaShowerPlacementBlueprint.cs

@@ -5,6 +5,7 @@ using System.Linq;
 using NUnit.Framework;
 using osu.Framework.Testing;
 using osu.Framework.Utils;
+using osu.Game.Beatmaps;
 using osu.Game.Beatmaps.ControlPoints;
 using osu.Game.Rulesets.Catch.Edit.Blueprints;
 using osu.Game.Rulesets.Catch.Edit.Blueprints.Components;
@@ -26,7 +27,7 @@ namespace osu.Game.Rulesets.Catch.Tests.Editor
         protected override void AddHitObject(DrawableHitObject hitObject)
         {
             // Create nested bananas (but positions are not randomized because beatmap processing is not done).
-            hitObject.HitObject.ApplyDefaults(new ControlPointInfo(), Beatmap.Value.BeatmapInfo.BaseDifficulty);
+            hitObject.HitObject.ApplyDefaults(new ControlPointInfo(), new BeatmapDifficulty());
 
             base.AddHitObject(hitObject);
         }

osu.Game.Rulesets.Catch.Tests/Editor/TestSceneCatchDistanceSnapGrid.cs

@@ -0,0 +1,91 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Input.Events;
+using osu.Framework.Timing;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Catch.Edit;
+using osu.Game.Rulesets.Catch.Edit.Blueprints.Components;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Catch.UI;
+using osu.Game.Rulesets.UI;
+using osu.Game.Rulesets.UI.Scrolling;
+using osu.Game.Tests.Visual;
+using osuTK;
+
+namespace osu.Game.Rulesets.Catch.Tests.Editor
+{
+    public class TestSceneCatchDistanceSnapGrid : OsuManualInputManagerTestScene
+    {
+        private readonly ManualClock manualClock = new ManualClock();
+
+        [Cached(typeof(Playfield))]
+        private readonly CatchPlayfield playfield;
+
+        private ScrollingHitObjectContainer hitObjectContainer => playfield.HitObjectContainer;
+
+        private readonly CatchDistanceSnapGrid distanceGrid;
+
+        private readonly FruitOutline fruitOutline;
+
+        private readonly Fruit fruit = new Fruit();
+
+        public TestSceneCatchDistanceSnapGrid()
+        {
+            Child = new Container
+            {
+                Anchor = Anchor.Centre,
+                Origin = Anchor.Centre,
+                RelativeSizeAxes = Axes.Y,
+                Width = 500,
+
+                Children = new Drawable[]
+                {
+                    new ScrollingTestContainer(ScrollingDirection.Down)
+                    {
+                        RelativeSizeAxes = Axes.Both,
+                        Child = playfield = new CatchPlayfield(new BeatmapDifficulty())
+                        {
+                            RelativeSizeAxes = Axes.Both,
+                            Clock = new FramedClock(manualClock)
+                        }
+                    },
+                    distanceGrid = new CatchDistanceSnapGrid(new double[] { 0, -1, 1 }),
+                    fruitOutline = new FruitOutline()
+                },
+            };
+        }
+
+        protected override void Update()
+        {
+            base.Update();
+
+            distanceGrid.StartTime = 100;
+            distanceGrid.StartX = 250;
+
+            Vector2 screenSpacePosition = InputManager.CurrentState.Mouse.Position;
+
+            var result = distanceGrid.GetSnappedPosition(screenSpacePosition);
+
+            if (result != null)
+            {
+                fruit.OriginalX = hitObjectContainer.ToLocalSpace(result.ScreenSpacePosition).X;
+
+                if (result.Time != null)
+                    fruit.StartTime = result.Time.Value;
+            }
+
+            fruitOutline.Position = CatchHitObjectUtils.GetStartPosition(hitObjectContainer, fruit);
+            fruitOutline.UpdateFrom(fruit);
+        }
+
+        protected override bool OnScroll(ScrollEvent e)
+        {
+            manualClock.CurrentTime -= e.ScrollDelta.Y * 50;
+            return true;
+        }
+    }
+}

osu.Game.Rulesets.Catch.Tests/Editor/TestSceneJuiceStreamPlacementBlueprint.cs

@@ -0,0 +1,156 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using osu.Framework.Extensions.ObjectExtensions;
+using osu.Framework.Utils;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Catch.Edit.Blueprints;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Catch.Objects.Drawables;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Drawables;
+using osuTK.Input;
+
+namespace osu.Game.Rulesets.Catch.Tests.Editor
+{
+    public class TestSceneJuiceStreamPlacementBlueprint : CatchPlacementBlueprintTestScene
+    {
+        private const double velocity = 0.5;
+
+        private JuiceStream lastObject => LastObject?.HitObject as JuiceStream;
+
+        protected override IBeatmap GetPlayableBeatmap()
+        {
+            var playable = base.GetPlayableBeatmap();
+            playable.Difficulty.SliderTickRate = 5;
+            playable.Difficulty.SliderMultiplier = velocity * 10;
+            return playable;
+        }
+
+        [Test]
+        public void TestBasicPlacement()
+        {
+            double[] times = { 300, 800 };
+            float[] positions = { 100, 200 };
+            addPlacementSteps(times, positions);
+
+            AddAssert("juice stream is placed", () => lastObject != null);
+            AddAssert("start time is correct", () => Precision.AlmostEquals(lastObject.StartTime, times[0]));
+            AddAssert("end time is correct", () => Precision.AlmostEquals(lastObject.EndTime, times[1]));
+            AddAssert("start position is correct", () => Precision.AlmostEquals(lastObject.OriginalX, positions[0]));
+            AddAssert("end position is correct", () => Precision.AlmostEquals(lastObject.EndX, positions[1]));
+        }
+
+        [Test]
+        public void TestEmptyNotCommitted()
+        {
+            addMoveAndClickSteps(100, 100);
+            addMoveAndClickSteps(100, 100);
+            addMoveAndClickSteps(100, 100, true);
+            AddAssert("juice stream not placed", () => lastObject == null);
+        }
+
+        [Test]
+        public void TestMultipleSegments()
+        {
+            double[] times = { 100, 300, 500, 700 };
+            float[] positions = { 100, 150, 100, 100 };
+            addPlacementSteps(times, positions);
+
+            AddAssert("has 4 vertices", () => lastObject.Path.ControlPoints.Count == 4);
+            addPathCheckStep(times, positions);
+        }
+
+        [Test]
+        public void TestVelocityLimit()
+        {
+            double[] times = { 100, 300 };
+            float[] positions = { 200, 500 };
+            addPlacementSteps(times, positions);
+            addPathCheckStep(times, new float[] { 200, 300 });
+        }
+
+        [Test]
+        public void TestPreviousVerticesAreFixed()
+        {
+            double[] times = { 100, 300, 500, 700 };
+            float[] positions = { 200, 400, 100, 500 };
+            addPlacementSteps(times, positions);
+            addPathCheckStep(times, new float[] { 200, 300, 200, 300 });
+        }
+
+        [Test]
+        public void TestClampedPositionIsRestored()
+        {
+            double[] times = { 100, 300, 500 };
+            float[] positions = { 200, 200, 0, 250 };
+
+            addMoveAndClickSteps(times[0], positions[0]);
+            addMoveAndClickSteps(times[1], positions[1]);
+            AddMoveStep(times[2], positions[2]);
+            addMoveAndClickSteps(times[2], positions[3], true);
+
+            addPathCheckStep(times, new float[] { 200, 200, 250 });
+        }
+
+        [Test]
+        public void TestFirstVertexIsFixed()
+        {
+            double[] times = { 100, 200 };
+            float[] positions = { 100, 300 };
+            addPlacementSteps(times, positions);
+            addPathCheckStep(times, new float[] { 100, 150 });
+        }
+
+        [Test]
+        public void TestOutOfOrder()
+        {
+            double[] times = { 100, 700, 500, 300 };
+            float[] positions = { 100, 200, 150, 50 };
+            addPlacementSteps(times, positions);
+            addPathCheckStep(times, positions);
+        }
+
+        [Test]
+        public void TestMoveBeforeFirstVertex()
+        {
+            double[] times = { 300, 500, 100 };
+            float[] positions = { 100, 100, 100 };
+            addPlacementSteps(times, positions);
+            AddAssert("start time is correct", () => Precision.AlmostEquals(lastObject.StartTime, times[0]));
+            AddAssert("end time is correct", () => Precision.AlmostEquals(lastObject.EndTime, times[1], 1e-3));
+        }
+
+        protected override DrawableHitObject CreateHitObject(HitObject hitObject) => new DrawableJuiceStream((JuiceStream)hitObject);
+
+        protected override PlacementBlueprint CreateBlueprint() => new JuiceStreamPlacementBlueprint();
+
+        private void addMoveAndClickSteps(double time, float position, bool end = false)
+        {
+            AddMoveStep(time, position);
+            AddClickStep(end ? MouseButton.Right : MouseButton.Left);
+        }
+
+        private void addPlacementSteps(double[] times, float[] positions)
+        {
+            for (int i = 0; i < times.Length; i++)
+                addMoveAndClickSteps(times[i], positions[i], i == times.Length - 1);
+        }
+
+        private void addPathCheckStep(double[] times, float[] positions) => AddStep("assert path is correct", () =>
+            Assert.That(getPositions(times), Is.EqualTo(positions).Within(Precision.FLOAT_EPSILON)));
+
+        private float[] getPositions(IEnumerable<double> times)
+        {
+            JuiceStream hitObject = lastObject.AsNonNull();
+            return times
+                   .Select(time => (time - hitObject.StartTime) * hitObject.Velocity)
+                   .Select(distance => hitObject.EffectiveX + hitObject.Path.PositionAt(distance / hitObject.Distance).X)
+                   .ToArray();
+        }
+    }
+}

osu.Game.Rulesets.Catch.Tests/Editor/TestSceneJuiceStreamSelectionBlueprint.cs

@@ -1,38 +1,286 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-using osu.Game.Beatmaps;
-using osu.Game.Beatmaps.ControlPoints;
+using System.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using osu.Framework.Testing;
+using osu.Framework.Timing;
+using osu.Framework.Utils;
 using osu.Game.Rulesets.Catch.Edit.Blueprints;
+using osu.Game.Rulesets.Catch.Edit.Blueprints.Components;
 using osu.Game.Rulesets.Catch.Objects;
 using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Objects.Types;
 using osuTK;
+using osuTK.Input;
 
 namespace osu.Game.Rulesets.Catch.Tests.Editor
 {
     public class TestSceneJuiceStreamSelectionBlueprint : CatchSelectionBlueprintTestScene
     {
-        public TestSceneJuiceStreamSelectionBlueprint()
+        private JuiceStream hitObject;
+
+        private readonly ManualClock manualClock = new ManualClock();
+
+        [SetUp]
+        public void SetUp() => Schedule(() =>
         {
-            var hitObject = new JuiceStream
+            EditorBeatmap.Clear();
+            Content.Clear();
+
+            manualClock.CurrentTime = 0;
+            Content.Clock = new FramedClock(manualClock);
+
+            InputManager.ReleaseButton(MouseButton.Left);
+            InputManager.ReleaseKey(Key.ShiftLeft);
+            InputManager.ReleaseKey(Key.ControlLeft);
+        });
+
+        [Test]
+        public void TestBasicComponentLayout()
+        {
+            double[] times = { 100, 300, 500 };
+            float[] positions = { 100, 200, 100 };
+            addBlueprintStep(times, positions);
+
+            for (int i = 0; i < times.Length; i++)
+                addVertexCheckStep(times.Length, i, times[i], positions[i]);
+
+            AddAssert("correct outline count", () =>
             {
-                OriginalX = 100,
-                StartTime = 100,
-                Path = new SliderPath(PathType.PerfectCurve, new[]
+                int expected = hitObject.NestedHitObjects.Count(h => !(h is TinyDroplet));
+                return this.ChildrenOfType<FruitOutline>().Count() == expected;
+            });
+            AddAssert("correct vertex piece count", () =>
+                this.ChildrenOfType<VertexPiece>().Count() == times.Length);
+
+            AddAssert("first vertex is semitransparent", () =>
+                Precision.DefinitelyBigger(1, this.ChildrenOfType<VertexPiece>().First().Alpha));
+        }
+
+        [Test]
+        public void TestVertexDrag()
+        {
+            double[] times = { 100, 400, 700 };
+            float[] positions = { 100, 100, 100 };
+            addBlueprintStep(times, positions);
+
+            addDragStartStep(times[1], positions[1]);
+
+            AddMouseMoveStep(500, 150);
+            addVertexCheckStep(3, 1, 500, 150);
+
+            addDragEndStep();
+            addDragStartStep(times[2], positions[2]);
+
+            AddMouseMoveStep(300, 50);
+            addVertexCheckStep(3, 1, 300, 50);
+            addVertexCheckStep(3, 2, 500, 150);
+
+            AddMouseMoveStep(-100, 100);
+            addVertexCheckStep(3, 1, times[0], positions[0]);
+        }
+
+        [Test]
+        public void TestMultipleDrag()
+        {
+            double[] times = { 100, 300, 500, 700 };
+            float[] positions = { 100, 100, 100, 100 };
+            addBlueprintStep(times, positions);
+
+            AddMouseMoveStep(times[1], positions[1]);
+            AddStep("press left", () => InputManager.PressButton(MouseButton.Left));
+            AddStep("release left", () => InputManager.ReleaseButton(MouseButton.Left));
+            AddStep("hold control", () => InputManager.PressKey(Key.ControlLeft));
+            addDragStartStep(times[2], positions[2]);
+
+            AddMouseMoveStep(times[2] - 50, positions[2] - 50);
+            addVertexCheckStep(4, 1, times[1] - 50, positions[1] - 50);
+            addVertexCheckStep(4, 2, times[2] - 50, positions[2] - 50);
+        }
+
+        [Test]
+        public void TestClampedPositionIsRestored()
+        {
+            const double velocity = 0.25;
+            double[] times = { 100, 500, 700 };
+            float[] positions = { 100, 100, 100 };
+            addBlueprintStep(times, positions, velocity);
+
+            addDragStartStep(times[1], positions[1]);
+
+            AddMouseMoveStep(times[1], 200);
+            addVertexCheckStep(3, 1, times[1], 200);
+            addVertexCheckStep(3, 2, times[2], 150);
+
+            AddMouseMoveStep(times[1], 100);
+            addVertexCheckStep(3, 1, times[1], 100);
+            // Stored position is restored.
+            addVertexCheckStep(3, 2, times[2], positions[2]);
+
+            AddMouseMoveStep(times[1], 300);
+            addDragEndStep();
+            addDragStartStep(times[1], 300);
+
+            AddMouseMoveStep(times[1], 100);
+            // Position is different because a changed position is committed when the previous drag is ended.
+            addVertexCheckStep(3, 2, times[2], 250);
+        }
+
+        [Test]
+        public void TestScrollWhileDrag()
+        {
+            double[] times = { 300, 500 };
+            float[] positions = { 100, 100 };
+            addBlueprintStep(times, positions);
+
+            addDragStartStep(times[1], positions[1]);
+            // This mouse move is necessary to start drag and capture the input.
+            AddMouseMoveStep(times[1], positions[1] + 50);
+
+            AddStep("scroll playfield", () => manualClock.CurrentTime += 200);
+            AddMouseMoveStep(times[1] + 200, positions[1] + 100);
+            addVertexCheckStep(2, 1, times[1] + 200, positions[1] + 100);
+        }
+
+        [Test]
+        public void TestUpdateFromHitObject()
+        {
+            double[] times = { 100, 300 };
+            float[] positions = { 200, 200 };
+            addBlueprintStep(times, positions);
+
+            AddStep("update hit object path", () =>
+            {
+                hitObject.Path = new SliderPath(PathType.PerfectCurve, new[]
                 {
                     Vector2.Zero,
-                    new Vector2(200, 100),
+                    new Vector2(100, 100),
                     new Vector2(0, 200),
-                }),
-            };
-            var controlPoint = new ControlPointInfo();
-            controlPoint.Add(0, new TimingControlPoint
-            {
-                BeatLength = 100
+                });
+                EditorBeatmap.Update(hitObject);
             });
-            hitObject.ApplyDefaults(controlPoint, new BeatmapDifficulty { CircleSize = 0 });
+            AddAssert("path is updated", () => getVertices().Count > 2);
+        }
+
+        [Test]
+        public void TestAddVertex()
+        {
+            double[] times = { 100, 700 };
+            float[] positions = { 200, 200 };
+            addBlueprintStep(times, positions, 0.2);
+
+            addAddVertexSteps(500, 150);
+            addVertexCheckStep(3, 1, 500, 150);
+
+            addAddVertexSteps(90, 220);
+            addVertexCheckStep(4, 1, times[0], positions[0]);
+
+            addAddVertexSteps(750, 180);
+            addVertexCheckStep(5, 4, 750, 180);
+            AddAssert("duration is changed", () => Precision.AlmostEquals(hitObject.Duration, 800 - times[0], 1e-3));
+        }
+
+        [Test]
+        public void TestDeleteVertex()
+        {
+            double[] times = { 100, 300, 500 };
+            float[] positions = { 100, 200, 150 };
+            addBlueprintStep(times, positions);
+
+            addDeleteVertexSteps(times[1], positions[1]);
+            addVertexCheckStep(2, 1, times[2], positions[2]);
+
+            // The first vertex cannot be deleted.
+            addDeleteVertexSteps(times[0], positions[0]);
+            addVertexCheckStep(2, 0, times[0], positions[0]);
+
+            addDeleteVertexSteps(times[2], positions[2]);
+            addVertexCheckStep(1, 0, times[0], positions[0]);
+        }
+
+        [Test]
+        public void TestVertexResampling()
+        {
+            addBlueprintStep(100, 100, new SliderPath(PathType.PerfectCurve, new[]
+            {
+                Vector2.Zero,
+                new Vector2(100, 100),
+                new Vector2(50, 200),
+            }), 0.5);
+            AddAssert("1 vertex per 1 nested HO", () => getVertices().Count == hitObject.NestedHitObjects.Count);
+            AddAssert("slider path not yet changed", () => hitObject.Path.ControlPoints[0].Type == PathType.PerfectCurve);
+            addAddVertexSteps(150, 150);
+            AddAssert("slider path change to linear", () => hitObject.Path.ControlPoints[0].Type == PathType.Linear);
+        }
+
+        private void addBlueprintStep(double time, float x, SliderPath sliderPath, double velocity) => AddStep("add selection blueprint", () =>
+        {
+            hitObject = new JuiceStream
+            {
+                StartTime = time,
+                X = x,
+                Path = sliderPath,
+            };
+            EditorBeatmap.Difficulty.SliderMultiplier = velocity;
+            EditorBeatmap.Add(hitObject);
+            EditorBeatmap.Update(hitObject);
+            Assert.That(hitObject.Velocity, Is.EqualTo(velocity));
             AddBlueprint(new JuiceStreamSelectionBlueprint(hitObject));
+        });
+
+        private void addBlueprintStep(double[] times, float[] positions, double velocity = 0.5)
+        {
+            var path = new JuiceStreamPath();
+            for (int i = 1; i < times.Length; i++)
+                path.Add((times[i] - times[0]) * velocity, positions[i] - positions[0]);
+
+            var sliderPath = new SliderPath();
+            path.ConvertToSliderPath(sliderPath, 0);
+            addBlueprintStep(times[0], positions[0], sliderPath, velocity);
+        }
+
+        private IReadOnlyList<JuiceStreamPathVertex> getVertices() => this.ChildrenOfType<EditablePath>().Single().Vertices;
+
+        private void addVertexCheckStep(int count, int index, double time, float x) => AddAssert($"vertex {index} of {count} at {time}, {x}", () =>
+        {
+            double expectedDistance = (time - hitObject.StartTime) * hitObject.Velocity;
+            float expectedX = x - hitObject.OriginalX;
+            var vertices = getVertices();
+            return vertices.Count == count &&
+                   Precision.AlmostEquals(vertices[index].Distance, expectedDistance, 1e-3) &&
+                   Precision.AlmostEquals(vertices[index].X, expectedX);
+        });
+
+        private void addDragStartStep(double time, float x)
+        {
+            AddMouseMoveStep(time, x);
+            AddStep("start dragging", () => InputManager.PressButton(MouseButton.Left));
+        }
+
+        private void addDragEndStep() => AddStep("end dragging", () => InputManager.ReleaseButton(MouseButton.Left));
+
+        private void addAddVertexSteps(double time, float x)
+        {
+            AddMouseMoveStep(time, x);
+            AddStep("add vertex", () =>
+            {
+                InputManager.PressKey(Key.ControlLeft);
+                InputManager.Click(MouseButton.Left);
+                InputManager.ReleaseKey(Key.ControlLeft);
+            });
+        }
+
+        private void addDeleteVertexSteps(double time, float x)
+        {
+            AddMouseMoveStep(time, x);
+            AddStep("delete vertex", () =>
+            {
+                InputManager.PressKey(Key.ShiftLeft);
+                InputManager.Click(MouseButton.Left);
+                InputManager.ReleaseKey(Key.ShiftLeft);
+            });
         }
     }
 }

osu.Game.Rulesets.Catch.Tests/JuiceStreamPathTest.cs

@@ -154,7 +154,7 @@ namespace osu.Game.Rulesets.Catch.Tests
                     } while (rng.Next(2) != 0);
 
                     int length = sliderPath.ControlPoints.Count - start + 1;
-                    sliderPath.ControlPoints[start].Type.Value = length <= 2 ? PathType.Linear : length == 3 ? PathType.PerfectCurve : PathType.Bezier;
+                    sliderPath.ControlPoints[start].Type = length <= 2 ? PathType.Linear : length == 3 ? PathType.PerfectCurve : PathType.Bezier;
                 } while (rng.Next(3) != 0);
 
                 if (rng.Next(5) == 0)
@@ -210,13 +210,13 @@ namespace osu.Game.Rulesets.Catch.Tests
 
                 path.ConvertToSliderPath(sliderPath, sliderStartY);
                 Assert.That(sliderPath.Distance, Is.EqualTo(path.Distance).Within(1e-3));
-                Assert.That(sliderPath.ControlPoints[0].Position.Value.X, Is.EqualTo(path.Vertices[0].X));
+                Assert.That(sliderPath.ControlPoints[0].Position.X, Is.EqualTo(path.Vertices[0].X));
                 assertInvariants(path.Vertices, true);
 
                 foreach (var point in sliderPath.ControlPoints)
                 {
-                    Assert.That(point.Type.Value, Is.EqualTo(PathType.Linear).Or.Null);
-                    Assert.That(sliderStartY + point.Position.Value.Y, Is.InRange(0, JuiceStreamPath.OSU_PLAYFIELD_HEIGHT));
+                    Assert.That(point.Type, Is.EqualTo(PathType.Linear).Or.Null);
+                    Assert.That(sliderStartY + point.Position.Y, Is.InRange(0, JuiceStreamPath.OSU_PLAYFIELD_HEIGHT));
                 }
 
                 for (int i = 0; i < 10; i++)

osu.Game.Rulesets.Catch.Tests/Mods/CatchModMirrorTest.cs

@@ -0,0 +1,120 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using NUnit.Framework;
+using osu.Framework.Utils;
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Rulesets.Catch.Beatmaps;
+using osu.Game.Rulesets.Catch.Mods;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Catch.UI;
+using osu.Game.Rulesets.Objects;
+using osuTK;
+
+namespace osu.Game.Rulesets.Catch.Tests.Mods
+{
+    [TestFixture]
+    public class CatchModMirrorTest
+    {
+        [Test]
+        public void TestModMirror()
+        {
+            IBeatmap original = createBeatmap(false);
+            IBeatmap mirrored = createBeatmap(true);
+
+            assertEffectivePositionsMirrored(original, mirrored);
+        }
+
+        private static IBeatmap createBeatmap(bool withMirrorMod)
+        {
+            var beatmap = createRawBeatmap();
+            var mirrorMod = new CatchModMirror();
+
+            var beatmapProcessor = new CatchBeatmapProcessor(beatmap);
+            beatmapProcessor.PreProcess();
+
+            foreach (var hitObject in beatmap.HitObjects)
+                hitObject.ApplyDefaults(new ControlPointInfo(), new BeatmapDifficulty());
+
+            beatmapProcessor.PostProcess();
+
+            if (withMirrorMod)
+                mirrorMod.ApplyToBeatmap(beatmap);
+
+            return beatmap;
+        }
+
+        private static IBeatmap createRawBeatmap() => new Beatmap
+        {
+            HitObjects = new List<HitObject>
+            {
+                new Fruit
+                {
+                    OriginalX = 150,
+                    StartTime = 0
+                },
+                new Fruit
+                {
+                    OriginalX = 450,
+                    StartTime = 500
+                },
+                new JuiceStream
+                {
+                    OriginalX = 250,
+                    Path = new SliderPath
+                    {
+                        ControlPoints =
+                        {
+                            new PathControlPoint(new Vector2(-100, 1)),
+                            new PathControlPoint(new Vector2(0, 2)),
+                            new PathControlPoint(new Vector2(100, 3)),
+                            new PathControlPoint(new Vector2(0, 4))
+                        }
+                    },
+                    StartTime = 1000,
+                },
+                new BananaShower
+                {
+                    StartTime = 5000,
+                    Duration = 5000
+                }
+            }
+        };
+
+        private static void assertEffectivePositionsMirrored(IBeatmap original, IBeatmap mirrored)
+        {
+            if (original.HitObjects.Count != mirrored.HitObjects.Count)
+                Assert.Fail($"Top-level object count mismatch (original: {original.HitObjects.Count}, mirrored: {mirrored.HitObjects.Count})");
+
+            for (int i = 0; i < original.HitObjects.Count; ++i)
+            {
+                var originalObject = (CatchHitObject)original.HitObjects[i];
+                var mirroredObject = (CatchHitObject)mirrored.HitObjects[i];
+
+                // banana showers themselves are exempt, as we only really care about their nested bananas' positions.
+                if (!effectivePositionMirrored(originalObject, mirroredObject) && !(originalObject is BananaShower))
+                    Assert.Fail($"{originalObject.GetType().Name} at time {originalObject.StartTime} is not mirrored ({printEffectivePositions(originalObject, mirroredObject)})");
+
+                if (originalObject.NestedHitObjects.Count != mirroredObject.NestedHitObjects.Count)
+                    Assert.Fail($"{originalObject.GetType().Name} nested object count mismatch (original: {originalObject.NestedHitObjects.Count}, mirrored: {mirroredObject.NestedHitObjects.Count})");
+
+                for (int j = 0; j < originalObject.NestedHitObjects.Count; ++j)
+                {
+                    var originalNested = (CatchHitObject)originalObject.NestedHitObjects[j];
+                    var mirroredNested = (CatchHitObject)mirroredObject.NestedHitObjects[j];
+
+                    if (!effectivePositionMirrored(originalNested, mirroredNested))
+                        Assert.Fail($"{originalObject.GetType().Name}'s nested {originalNested.GetType().Name} at time {originalObject.StartTime} is not mirrored ({printEffectivePositions(originalNested, mirroredNested)})");
+                }
+            }
+        }
+
+        private static string printEffectivePositions(CatchHitObject original, CatchHitObject mirrored)
+            => $"original X: {original.EffectiveX}, mirrored X is: {mirrored.EffectiveX}, mirrored X should be: {CatchPlayfield.WIDTH - original.EffectiveX}";
+
+        private static bool effectivePositionMirrored(CatchHitObject original, CatchHitObject mirrored)
+            => Precision.AlmostEquals(original.EffectiveX, CatchPlayfield.WIDTH - mirrored.EffectiveX);
+    }
+}

osu.Game.Rulesets.Catch.Tests/Mods/TestSceneCatchModNoScope.cs

@@ -0,0 +1,110 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using NUnit.Framework;
+using osu.Framework.Utils;
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.Timing;
+using osu.Game.Rulesets.Catch.Mods;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Catch.UI;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Tests.Visual;
+
+namespace osu.Game.Rulesets.Catch.Tests.Mods
+{
+    public class TestSceneCatchModNoScope : ModTestScene
+    {
+        protected override Ruleset CreatePlayerRuleset() => new CatchRuleset();
+
+        [Test]
+        public void TestVisibleDuringBreak()
+        {
+            CreateModTest(new ModTestData
+            {
+                Mod = new CatchModNoScope
+                {
+                    HiddenComboCount = { Value = 0 },
+                },
+                Autoplay = true,
+                PassCondition = () => true,
+                Beatmap = new Beatmap
+                {
+                    HitObjects = new List<HitObject>
+                    {
+                        new Fruit
+                        {
+                            X = CatchPlayfield.CENTER_X,
+                            StartTime = 1000,
+                        },
+                        new Fruit
+                        {
+                            X = CatchPlayfield.CENTER_X,
+                            StartTime = 5000,
+                        }
+                    },
+                    Breaks = new List<BreakPeriod>
+                    {
+                        new BreakPeriod(2000, 4000),
+                    }
+                }
+            });
+
+            AddUntilStep("wait for catcher to hide", () => catcherAlphaAlmostEquals(0));
+            AddUntilStep("wait for start of break", isBreak);
+            AddUntilStep("wait for catcher to show", () => catcherAlphaAlmostEquals(1));
+            AddUntilStep("wait for end of break", () => !isBreak());
+            AddUntilStep("wait for catcher to hide", () => catcherAlphaAlmostEquals(0));
+        }
+
+        [Test]
+        public void TestVisibleAfterComboBreak()
+        {
+            CreateModTest(new ModTestData
+            {
+                Mod = new CatchModNoScope
+                {
+                    HiddenComboCount = { Value = 2 },
+                },
+                Autoplay = true,
+                PassCondition = () => true,
+                Beatmap = new Beatmap
+                {
+                    HitObjects = new List<HitObject>
+                    {
+                        new Fruit
+                        {
+                            X = 0,
+                            StartTime = 1000,
+                        },
+                        new Fruit
+                        {
+                            X = CatchPlayfield.CENTER_X,
+                            StartTime = 3000,
+                        },
+                        new Fruit
+                        {
+                            X = CatchPlayfield.WIDTH,
+                            StartTime = 5000,
+                        },
+                    }
+                }
+            });
+
+            AddAssert("catcher must start visible", () => catcherAlphaAlmostEquals(1));
+            AddUntilStep("wait for combo", () => Player.ScoreProcessor.Combo.Value >= 2);
+            AddAssert("catcher must dim after combo", () => !catcherAlphaAlmostEquals(1));
+            AddStep("break combo", () => Player.ScoreProcessor.Combo.Value = 0);
+            AddUntilStep("wait for catcher to show", () => catcherAlphaAlmostEquals(1));
+        }
+
+        private bool isBreak() => Player.IsBreakTime.Value;
+
+        private bool catcherAlphaAlmostEquals(float alpha)
+        {
+            var playfield = (CatchPlayfield)Player.DrawableRuleset.Playfield;
+            return Precision.AlmostEquals(playfield.CatcherArea.Alpha, alpha);
+        }
+    }
+}

osu.Game.Rulesets.Catch.Tests/TestSceneCatchSkinConfiguration.cs

@@ -3,7 +3,6 @@
 
 using System.Linq;
 using NUnit.Framework;
-using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
@@ -24,16 +23,12 @@ namespace osu.Game.Rulesets.Catch.Tests
 {
     public class TestSceneCatchSkinConfiguration : OsuTestScene
     {
-        [Cached]
-        private readonly DroppedObjectContainer droppedObjectContainer;
-
         private Catcher catcher;
 
         private readonly Container container;
 
         public TestSceneCatchSkinConfiguration()
         {
-            Add(droppedObjectContainer = new DroppedObjectContainer());
             Add(container = new Container { RelativeSizeAxes = Axes.Both });
         }
 
@@ -46,7 +41,7 @@ namespace osu.Game.Rulesets.Catch.Tests
                 var skin = new TestSkin { FlipCatcherPlate = flip };
                 container.Child = new SkinProvidingContainer(skin)
                 {
-                    Child = catcher = new Catcher(new Container())
+                    Child = catcher = new Catcher(new DroppedObjectContainer())
                     {
                         Anchor = Anchor.Centre
                     }

osu.Game.Rulesets.Catch.Tests/TestSceneCatcher.cs

@@ -31,23 +31,10 @@ namespace osu.Game.Rulesets.Catch.Tests
         [Resolved]
         private OsuConfigManager config { get; set; }
 
-        [Cached]
-        private readonly DroppedObjectContainer droppedObjectContainer;
-
-        private readonly Container trailContainer;
+        private DroppedObjectContainer droppedObjectContainer;
 
         private TestCatcher catcher;
 
-        public TestSceneCatcher()
-        {
-            Add(trailContainer = new Container
-            {
-                Anchor = Anchor.Centre,
-                Depth = -1
-            });
-            Add(droppedObjectContainer = new DroppedObjectContainer());
-        }
-
         [SetUp]
         public void SetUp() => Schedule(() =>
         {
@@ -56,13 +43,17 @@ namespace osu.Game.Rulesets.Catch.Tests
                 CircleSize = 0,
             };
 
-            if (catcher != null)
-                Remove(catcher);
+            droppedObjectContainer = new DroppedObjectContainer();
 
-            Add(catcher = new TestCatcher(trailContainer, difficulty)
+            Child = new Container
             {
-                Anchor = Anchor.Centre
-            });
+                Anchor = Anchor.Centre,
+                Children = new Drawable[]
+                {
+                    droppedObjectContainer,
+                    catcher = new TestCatcher(droppedObjectContainer, difficulty),
+                }
+            };
         });
 
         [Test]
@@ -112,7 +103,7 @@ namespace osu.Game.Rulesets.Catch.Tests
         [Test]
         public void TestCatcherCatchWidth()
         {
-            var halfWidth = Catcher.CalculateCatchWidth(new BeatmapDifficulty { CircleSize = 0 }) / 2;
+            float halfWidth = Catcher.CalculateCatchWidth(new BeatmapDifficulty { CircleSize = 0 }) / 2;
             AddStep("catch fruit", () =>
             {
                 attemptCatch(new Fruit { X = -halfWidth + 1 });
@@ -246,7 +237,7 @@ namespace osu.Game.Rulesets.Catch.Tests
 
         private void attemptCatch(Func<CatchHitObject> hitObject, int count)
         {
-            for (var i = 0; i < count; i++)
+            for (int i = 0; i < count; i++)
                 attemptCatch(hitObject(), out _, out _);
         }
 
@@ -299,15 +290,15 @@ namespace osu.Game.Rulesets.Catch.Tests
         {
             public IEnumerable<CaughtObject> CaughtObjects => this.ChildrenOfType<CaughtObject>();
 
-            public TestCatcher(Container trailsTarget, BeatmapDifficulty difficulty)
-                : base(trailsTarget, difficulty)
+            public TestCatcher(DroppedObjectContainer droppedObjectTarget, IBeatmapDifficultyInfo difficulty)
+                : base(droppedObjectTarget, difficulty)
             {
             }
         }
 
         public class TestKiaiFruit : Fruit
         {
-            protected override void ApplyDefaultsToSelf(ControlPointInfo controlPointInfo, BeatmapDifficulty difficulty)
+            protected override void ApplyDefaultsToSelf(ControlPointInfo controlPointInfo, IBeatmapDifficultyInfo difficulty)
             {
                 controlPointInfo.Add(0, new EffectControlPoint { KiaiMode = true });
                 base.ApplyDefaultsToSelf(controlPointInfo, difficulty);

osu.Game.Rulesets.Catch.Tests/TestSceneCatcherArea.cs

@@ -34,12 +34,13 @@ namespace osu.Game.Rulesets.Catch.Tests
 
         private ScheduledDelegate addManyFruit;
 
-        private BeatmapDifficulty beatmapDifficulty;
+        private IBeatmapDifficultyInfo beatmapDifficulty;
 
         public TestSceneCatcherArea()
         {
             AddSliderStep<float>("circle size", 0, 8, 5, createCatcher);
             AddToggleStep("hyper dash", t => this.ChildrenOfType<TestCatcherArea>().ForEach(area => area.ToggleHyperDash(t)));
+            AddToggleStep("toggle hit lighting", lighting => config.SetValue(OsuSetting.HitLighting, lighting));
 
             AddStep("catch centered fruit", () => attemptCatch(new Fruit()));
             AddStep("catch many random fruit", () =>
@@ -77,7 +78,7 @@ namespace osu.Game.Rulesets.Catch.Tests
                 {
                     area.OnNewResult(drawable, new CatchJudgementResult(fruit, new CatchJudgement())
                     {
-                        Type = area.MovableCatcher.CanCatch(fruit) ? HitResult.Great : HitResult.Miss
+                        Type = area.Catcher.CanCatch(fruit) ? HitResult.Great : HitResult.Miss
                     });
 
                     drawable.Expire();
@@ -119,16 +120,18 @@ namespace osu.Game.Rulesets.Catch.Tests
 
         private class TestCatcherArea : CatcherArea
         {
-            [Cached]
-            private readonly DroppedObjectContainer droppedObjectContainer;
-
-            public TestCatcherArea(BeatmapDifficulty beatmapDifficulty)
-                : base(beatmapDifficulty)
+            public TestCatcherArea(IBeatmapDifficultyInfo beatmapDifficulty)
             {
-                AddInternal(droppedObjectContainer = new DroppedObjectContainer());
+                var droppedObjectContainer = new DroppedObjectContainer();
+                Add(droppedObjectContainer);
+
+                Catcher = new Catcher(droppedObjectContainer, beatmapDifficulty)
+                {
+                    X = CatchPlayfield.CENTER_X
+                };
             }
 
-            public void ToggleHyperDash(bool status) => MovableCatcher.SetHyperDashState(status ? 2 : 1);
+            public void ToggleHyperDash(bool status) => Catcher.SetHyperDashState(status ? 2 : 1);
         }
     }
 }

osu.Game.Rulesets.Catch.Tests/TestSceneDrawableHitObjects.cs

@@ -97,7 +97,7 @@ namespace osu.Game.Rulesets.Catch.Tests
 
         private bool playfieldIsEmpty => !((CatchPlayfield)drawableRuleset.Playfield).AllHitObjects.Any(h => h.IsAlive);
 
-        private CatcherAnimationState catcherState => ((CatchPlayfield)drawableRuleset.Playfield).CatcherArea.MovableCatcher.CurrentState;
+        private CatcherAnimationState catcherState => ((CatchPlayfield)drawableRuleset.Playfield).Catcher.CurrentState;
 
         private void spawnFruits(bool hit = false)
         {
@@ -118,7 +118,7 @@ namespace osu.Game.Rulesets.Catch.Tests
 
         private void spawnJuiceStream(bool hit = false)
         {
-            var xCoords = getXCoords(hit);
+            float xCoords = getXCoords(hit);
 
             var juice = new JuiceStream
             {
@@ -162,7 +162,7 @@ namespace osu.Game.Rulesets.Catch.Tests
             float xCoords = CatchPlayfield.CENTER_X;
 
             if (drawableRuleset.Playfield is CatchPlayfield catchPlayfield)
-                catchPlayfield.CatcherArea.MovableCatcher.X = xCoords - x_offset;
+                catchPlayfield.Catcher.X = xCoords - x_offset;
 
             if (hit)
                 xCoords -= x_offset;

osu.Game.Rulesets.Catch.Tests/TestSceneHyperDash.cs

@@ -33,7 +33,7 @@ namespace osu.Game.Rulesets.Catch.Tests
                 // this needs to be done within the frame stable context due to how quickly hyperdash state changes occur.
                 Player.DrawableRuleset.FrameStableComponents.OnUpdate += d =>
                 {
-                    var catcher = Player.ChildrenOfType<CatcherArea>().FirstOrDefault()?.MovableCatcher;
+                    var catcher = Player.ChildrenOfType<Catcher>().FirstOrDefault();
 
                     if (catcher == null)
                         return;

osu.Game.Rulesets.Catch.Tests/TestSceneHyperDashColouring.cs

@@ -47,7 +47,7 @@ namespace osu.Game.Rulesets.Catch.Tests
         }
 
         [Test]
-        public void TestCustomEndGlowColour()
+        public void TestCustomAfterImageColour()
         {
             var skin = new TestSkin
             {
@@ -58,7 +58,7 @@ namespace osu.Game.Rulesets.Catch.Tests
         }
 
         [Test]
-        public void TestCustomEndGlowColourPriority()
+        public void TestCustomAfterImageColourPriority()
         {
             var skin = new TestSkin
             {
@@ -111,38 +111,45 @@ namespace osu.Game.Rulesets.Catch.Tests
             checkHyperDashFruitColour(skin, skin.HyperDashColour);
         }
 
-        private void checkHyperDashCatcherColour(ISkin skin, Color4 expectedCatcherColour, Color4? expectedEndGlowColour = null)
+        private void checkHyperDashCatcherColour(ISkin skin, Color4 expectedCatcherColour, Color4? expectedAfterImageColour = null)
         {
-            CatcherArea catcherArea = null;
             CatcherTrailDisplay trails = null;
+            Catcher catcher = null;
 
             AddStep("create hyper-dashing catcher", () =>
             {
-                Child = setupSkinHierarchy(catcherArea = new TestCatcherArea
+                CatcherArea catcherArea;
+                Child = setupSkinHierarchy(new Container
                 {
                     Anchor = Anchor.Centre,
-                    Origin = Anchor.Centre
+                    Child = catcherArea = new CatcherArea
+                    {
+                        Catcher = catcher = new Catcher(new DroppedObjectContainer())
+                        {
+                            Scale = new Vector2(4)
+                        }
+                    }
                 }, skin);
+                trails = catcherArea.ChildrenOfType<CatcherTrailDisplay>().Single();
             });
 
-            AddStep("get trails container", () =>
+            AddStep("start hyper-dash", () =>
             {
-                trails = catcherArea.OfType<CatcherTrailDisplay>().Single();
-                catcherArea.MovableCatcher.SetHyperDashState(2);
+                catcher.SetHyperDashState(2);
             });
 
-            AddUntilStep("catcher colour is correct", () => catcherArea.MovableCatcher.Colour == expectedCatcherColour);
+            AddUntilStep("catcher colour is correct", () => catcher.Colour == expectedCatcherColour);
 
             AddAssert("catcher trails colours are correct", () => trails.HyperDashTrailsColour == expectedCatcherColour);
-            AddAssert("catcher end-glow colours are correct", () => trails.EndGlowSpritesColour == (expectedEndGlowColour ?? expectedCatcherColour));
+            AddAssert("catcher after-image colours are correct", () => trails.HyperDashAfterImageColour == (expectedAfterImageColour ?? expectedCatcherColour));
 
             AddStep("finish hyper-dashing", () =>
             {
-                catcherArea.MovableCatcher.SetHyperDashState();
-                catcherArea.MovableCatcher.FinishTransforms();
+                catcher.SetHyperDashState();
+                catcher.FinishTransforms();
             });
 
-            AddAssert("catcher colour returned to white", () => catcherArea.MovableCatcher.Colour == Color4.White);
+            AddAssert("catcher colour returned to white", () => catcher.Colour == Color4.White);
         }
 
         private void checkHyperDashFruitColour(ISkin skin, Color4 expectedColour)
@@ -205,18 +212,5 @@ namespace osu.Game.Rulesets.Catch.Tests
             {
             }
         }
-
-        private class TestCatcherArea : CatcherArea
-        {
-            [Cached]
-            private readonly DroppedObjectContainer droppedObjectContainer;
-
-            public TestCatcherArea()
-            {
-                Scale = new Vector2(4f);
-
-                AddInternal(droppedObjectContainer = new DroppedObjectContainer());
-            }
-        }
     }
 }

osu.Game.Rulesets.Catch.Tests/osu.Game.Rulesets.Catch.Tests.csproj

@@ -2,7 +2,7 @@
   <Import Project="..\osu.TestProject.props" />
   <ItemGroup Label="Package References">
     <PackageReference Include="Appveyor.TestLogger" Version="2.0.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.10.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.0.0" />
     <PackageReference Include="NUnit" Version="3.13.2" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.0.0" />
     <PackageReference Update="Microsoft.EntityFrameworkCore.Sqlite" Version="2.1.4" />

osu.Game.Rulesets.Catch/Beatmaps/CatchBeatmapProcessor.cs

@@ -75,7 +75,7 @@ namespace osu.Game.Rulesets.Catch.Beatmaps
 
                     case JuiceStream juiceStream:
                         // Todo: BUG!! Stable used the last control point as the final position of the path, but it should use the computed path instead.
-                        lastPosition = juiceStream.OriginalX + juiceStream.Path.ControlPoints[^1].Position.Value.X;
+                        lastPosition = juiceStream.OriginalX + juiceStream.Path.ControlPoints[^1].Position.X;
 
                         // Todo: BUG!! Stable attempted to use the end time of the stream, but referenced it too early in execution and used the start time instead.
                         lastStartTime = juiceStream.StartTime;
@@ -211,7 +211,7 @@ namespace osu.Game.Rulesets.Catch.Beatmaps
 
             palpableObjects.Sort((h1, h2) => h1.StartTime.CompareTo(h2.StartTime));
 
-            double halfCatcherWidth = Catcher.CalculateCatchWidth(beatmap.BeatmapInfo.BaseDifficulty) / 2;
+            double halfCatcherWidth = Catcher.CalculateCatchWidth(beatmap.Difficulty) / 2;
 
             // Todo: This is wrong. osu!stable calculated hyperdashes using the full catcher size, excluding the margins.
             // This should theoretically cause impossible scenarios, but practically, likely due to the size of the playfield, it doesn't seem possible.
@@ -233,7 +233,7 @@ namespace osu.Game.Rulesets.Catch.Beatmaps
                 int thisDirection = nextObject.EffectiveX > currentObject.EffectiveX ? 1 : -1;
                 double timeToNext = nextObject.StartTime - currentObject.StartTime - 1000f / 60f / 4; // 1/4th of a frame of grace time, taken from osu-stable
                 double distanceToNext = Math.Abs(nextObject.EffectiveX - currentObject.EffectiveX) - (lastDirection == thisDirection ? lastExcess : halfCatcherWidth);
-                float distanceToHyper = (float)(timeToNext * Catcher.BASE_SPEED - distanceToNext);
+                float distanceToHyper = (float)(timeToNext * Catcher.BASE_DASH_SPEED - distanceToNext);
 
                 if (distanceToHyper < 0)
                 {

osu.Game.Rulesets.Catch/CatchRuleset.cs

@@ -117,6 +117,7 @@ namespace osu.Game.Rulesets.Catch
                     {
                         new CatchModDifficultyAdjust(),
                         new CatchModClassic(),
+                        new CatchModMirror(),
                     };
 
                 case ModType.Automation:
@@ -130,7 +131,9 @@ namespace osu.Game.Rulesets.Catch
                     return new Mod[]
                     {
                         new MultiMod(new ModWindUp(), new ModWindDown()),
-                        new CatchModFloatingFruits()
+                        new CatchModFloatingFruits(),
+                        new CatchModMuted(),
+                        new CatchModNoScope(),
                     };
 
                 default:
@@ -186,5 +189,7 @@ namespace osu.Game.Rulesets.Catch
         public override IConvertibleReplayFrame CreateConvertibleReplayFrame() => new CatchReplayFrame();
 
         public override HitObjectComposer CreateHitObjectComposer() => new CatchHitObjectComposer(this);
+
+        public override IBeatmapVerifier CreateBeatmapVerifier() => new CatchBeatmapVerifier();
     }
 }

osu.Game.Rulesets.Catch/CatchSkinComponents.cs

@@ -9,6 +9,7 @@ namespace osu.Game.Rulesets.Catch
         Banana,
         Droplet,
         Catcher,
-        CatchComboCounter
+        CatchComboCounter,
+        HitExplosion
     }
 }

osu.Game.Rulesets.Catch/Difficulty/CatchDifficultyCalculator.cs

@@ -34,7 +34,7 @@ namespace osu.Game.Rulesets.Catch.Difficulty
                 return new CatchDifficultyAttributes { Mods = mods, Skills = skills };
 
             // this is the same as osu!, so there's potential to share the implementation... maybe
-            double preempt = BeatmapDifficulty.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.ApproachRate, 1800, 1200, 450) / clockRate;
+            double preempt = IBeatmapDifficultyInfo.DifficultyRange(beatmap.Difficulty.ApproachRate, 1800, 1200, 450) / clockRate;
 
             return new CatchDifficultyAttributes
             {
@@ -52,7 +52,7 @@ namespace osu.Game.Rulesets.Catch.Difficulty
 
             // In 2B beatmaps, it is possible that a normal Fruit is placed in the middle of a JuiceStream.
             foreach (var hitObject in beatmap.HitObjects
-                                             .SelectMany(obj => obj is JuiceStream stream ? stream.NestedHitObjects : new[] { obj })
+                                             .SelectMany(obj => obj is JuiceStream stream ? stream.NestedHitObjects.AsEnumerable() : new[] { obj })
                                              .Cast<CatchHitObject>()
                                              .OrderBy(x => x.StartTime))
             {
@@ -69,10 +69,10 @@ namespace osu.Game.Rulesets.Catch.Difficulty
 
         protected override Skill[] CreateSkills(IBeatmap beatmap, Mod[] mods, double clockRate)
         {
-            halfCatcherWidth = Catcher.CalculateCatchWidth(beatmap.BeatmapInfo.BaseDifficulty) * 0.5f;
+            halfCatcherWidth = Catcher.CalculateCatchWidth(beatmap.Difficulty) * 0.5f;
 
             // For circle sizes above 5.5, reduce the catcher width further to simulate imperfect gameplay.
-            halfCatcherWidth *= 1 - (Math.Max(0, beatmap.BeatmapInfo.BaseDifficulty.CircleSize - 5.5f) * 0.0625f);
+            halfCatcherWidth *= 1 - (Math.Max(0, beatmap.Difficulty.CircleSize - 5.5f) * 0.0625f);
 
             return new Skill[]
             {

osu.Game.Rulesets.Catch/Difficulty/Preprocessing/CatchDifficultyHitObject.cs

@@ -28,7 +28,7 @@ namespace osu.Game.Rulesets.Catch.Difficulty.Preprocessing
             : base(hitObject, lastObject, clockRate)
         {
             // We will scale everything by this factor, so we can assume a uniform CircleSize among beatmaps.
-            var scalingFactor = normalized_hitobject_radius / halfCatcherWidth;
+            float scalingFactor = normalized_hitobject_radius / halfCatcherWidth;
 
             NormalizedPosition = BaseObject.EffectiveX * scalingFactor;
             LastNormalizedPosition = LastObject.EffectiveX * scalingFactor;

osu.Game.Rulesets.Catch/Difficulty/Skills/Movement.cs

@@ -9,7 +9,7 @@ using osu.Game.Rulesets.Mods;
 
 namespace osu.Game.Rulesets.Catch.Difficulty.Skills
 {
-    public class Movement : StrainSkill
+    public class Movement : StrainDecaySkill
     {
         private const float absolute_player_positioning_error = 16f;
         private const float normalized_hitobject_radius = 41.0f;

osu.Game.Rulesets.Catch/Edit/Blueprints/Components/EditablePath.cs

@@ -0,0 +1,190 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using JetBrains.Annotations;
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Primitives;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Objects.Types;
+using osu.Game.Rulesets.UI.Scrolling;
+using osuTK;
+
+namespace osu.Game.Rulesets.Catch.Edit.Blueprints.Components
+{
+    public abstract class EditablePath : CompositeDrawable
+    {
+        public int PathId => path.InvalidationID;
+
+        public IReadOnlyList<JuiceStreamPathVertex> Vertices => path.Vertices;
+
+        public int VertexCount => path.Vertices.Count;
+
+        protected readonly Func<float, double> PositionToDistance;
+
+        protected IReadOnlyList<VertexState> VertexStates => vertexStates;
+
+        private readonly JuiceStreamPath path = new JuiceStreamPath();
+
+        // Invariant: `path.Vertices.Count == vertexStates.Count`
+        private readonly List<VertexState> vertexStates = new List<VertexState>
+        {
+            new VertexState { IsFixed = true }
+        };
+
+        private readonly List<VertexState> previousVertexStates = new List<VertexState>();
+
+        [Resolved(CanBeNull = true)]
+        [CanBeNull]
+        private IBeatSnapProvider beatSnapProvider { get; set; }
+
+        protected EditablePath(Func<float, double> positionToDistance)
+        {
+            PositionToDistance = positionToDistance;
+
+            Anchor = Anchor.BottomLeft;
+        }
+
+        public void UpdateFrom(ScrollingHitObjectContainer hitObjectContainer, JuiceStream hitObject)
+        {
+            while (path.Vertices.Count < InternalChildren.Count)
+                RemoveInternal(InternalChildren[^1]);
+
+            while (InternalChildren.Count < path.Vertices.Count)
+                AddInternal(new VertexPiece());
+
+            double distanceToYFactor = -hitObjectContainer.LengthAtTime(hitObject.StartTime, hitObject.StartTime + 1 / hitObject.Velocity);
+
+            for (int i = 0; i < VertexCount; i++)
+            {
+                var piece = (VertexPiece)InternalChildren[i];
+                var vertex = path.Vertices[i];
+                piece.Position = new Vector2(vertex.X, (float)(vertex.Distance * distanceToYFactor));
+                piece.UpdateFrom(vertexStates[i]);
+            }
+        }
+
+        public void InitializeFromHitObject(JuiceStream hitObject)
+        {
+            var sliderPath = hitObject.Path;
+            path.ConvertFromSliderPath(sliderPath);
+
+            // If the original slider path has non-linear type segments, resample the vertices at nested hit object times to reduce the number of vertices.
+            if (sliderPath.ControlPoints.Any(p => p.Type != null && p.Type != PathType.Linear))
+            {
+                path.ResampleVertices(hitObject.NestedHitObjects
+                                               .Skip(1).TakeWhile(h => !(h is Fruit)) // Only droplets in the first span are used.
+                                               .Select(h => (h.StartTime - hitObject.StartTime) * hitObject.Velocity));
+            }
+
+            vertexStates.Clear();
+            vertexStates.AddRange(path.Vertices.Select((_, i) => new VertexState
+            {
+                IsFixed = i == 0
+            }));
+        }
+
+        public void UpdateHitObjectFromPath(JuiceStream hitObject)
+        {
+            path.ConvertToSliderPath(hitObject.Path, hitObject.LegacyConvertedY);
+
+            if (beatSnapProvider == null) return;
+
+            double endTime = hitObject.StartTime + path.Distance / hitObject.Velocity;
+            double snappedEndTime = beatSnapProvider.SnapTime(endTime, hitObject.StartTime);
+            hitObject.Path.ExpectedDistance.Value = (snappedEndTime - hitObject.StartTime) * hitObject.Velocity;
+        }
+
+        public Vector2 ToRelativePosition(Vector2 screenSpacePosition)
+        {
+            return ToLocalSpace(screenSpacePosition) - new Vector2(0, DrawHeight);
+        }
+
+        protected override bool ComputeIsMaskedAway(RectangleF maskingBounds) => false;
+
+        protected int AddVertex(double distance, float x)
+        {
+            int index = path.InsertVertex(distance);
+            path.SetVertexPosition(index, x);
+            vertexStates.Insert(index, new VertexState());
+
+            correctFixedVertexPositions();
+
+            Debug.Assert(vertexStates.Count == VertexCount);
+            return index;
+        }
+
+        protected bool RemoveVertex(int index)
+        {
+            if (index < 0 || index >= path.Vertices.Count)
+                return false;
+
+            if (vertexStates[index].IsFixed)
+                return false;
+
+            path.RemoveVertices((_, i) => i == index);
+
+            vertexStates.RemoveAt(index);
+            if (vertexStates.Count == 0)
+                vertexStates.Add(new VertexState());
+
+            Debug.Assert(vertexStates.Count == VertexCount);
+            return true;
+        }
+
+        protected void MoveSelectedVertices(double distanceDelta, float xDelta)
+        {
+            // Because the vertex list may be reordered due to distance change, the state list must be reordered as well.
+            previousVertexStates.Clear();
+            previousVertexStates.AddRange(vertexStates);
+
+            // We will recreate the path from scratch. Note that `Clear` leaves the first vertex.
+            int vertexCount = VertexCount;
+            path.Clear();
+            vertexStates.RemoveRange(1, vertexCount - 1);
+
+            for (int i = 1; i < vertexCount; i++)
+            {
+                var state = previousVertexStates[i];
+                double distance = state.VertexBeforeChange.Distance;
+                if (state.IsSelected)
+                    distance += distanceDelta;
+
+                int newIndex = path.InsertVertex(Math.Max(0, distance));
+                vertexStates.Insert(newIndex, state);
+            }
+
+            // First, restore positions of the non-selected vertices.
+            for (int i = 0; i < vertexCount; i++)
+            {
+                if (!vertexStates[i].IsSelected && !vertexStates[i].IsFixed)
+                    path.SetVertexPosition(i, vertexStates[i].VertexBeforeChange.X);
+            }
+
+            // Then, move the selected vertices.
+            for (int i = 0; i < vertexCount; i++)
+            {
+                if (vertexStates[i].IsSelected && !vertexStates[i].IsFixed)
+                    path.SetVertexPosition(i, vertexStates[i].VertexBeforeChange.X + xDelta);
+            }
+
+            // Finally, correct the position of fixed vertices.
+            correctFixedVertexPositions();
+        }
+
+        private void correctFixedVertexPositions()
+        {
+            for (int i = 0; i < VertexCount; i++)
+            {
+                if (vertexStates[i].IsFixed)
+                    path.SetVertexPosition(i, vertexStates[i].VertexBeforeChange.X);
+            }
+        }
+    }
+}

osu.Game.Rulesets.Catch/Edit/Blueprints/Components/PlacementEditablePath.cs

@@ -0,0 +1,49 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using osu.Game.Rulesets.Catch.Objects;
+using osuTK;
+
+namespace osu.Game.Rulesets.Catch.Edit.Blueprints.Components
+{
+    public class PlacementEditablePath : EditablePath
+    {
+        /// <summary>
+        /// The original position of the last added vertex.
+        /// This is not same as the last vertex of the current path because the vertex ordering can change.
+        /// </summary>
+        private JuiceStreamPathVertex lastVertex;
+
+        public PlacementEditablePath(Func<float, double> positionToDistance)
+            : base(positionToDistance)
+        {
+        }
+
+        public void AddNewVertex()
+        {
+            var endVertex = Vertices[^1];
+            int index = AddVertex(endVertex.Distance, endVertex.X);
+
+            for (int i = 0; i < VertexCount; i++)
+            {
+                VertexStates[i].IsSelected = i == index;
+                VertexStates[i].IsFixed = i != index;
+                VertexStates[i].VertexBeforeChange = Vertices[i];
+            }
+
+            lastVertex = Vertices[index];
+        }
+
+        /// <summary>
+        /// Move the vertex added by <see cref="AddNewVertex"/> in the last time.
+        /// </summary>
+        public void MoveLastVertex(Vector2 screenSpacePosition)
+        {
+            Vector2 position = ToRelativePosition(screenSpacePosition);
+            double distanceDelta = PositionToDistance(position.Y) - lastVertex.Distance;
+            float xDelta = position.X - lastVertex.X;
+            MoveSelectedVertices(distanceDelta, xDelta);
+        }
+    }
+}

osu.Game.Rulesets.Catch/Edit/Blueprints/Components/SelectionEditablePath.cs

@@ -0,0 +1,130 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using JetBrains.Annotations;
+using osu.Framework.Allocation;
+using osu.Framework.Graphics.Cursor;
+using osu.Framework.Graphics.UserInterface;
+using osu.Framework.Input.Events;
+using osu.Game.Graphics.UserInterface;
+using osu.Game.Screens.Edit;
+using osuTK;
+using osuTK.Input;
+
+namespace osu.Game.Rulesets.Catch.Edit.Blueprints.Components
+{
+    public class SelectionEditablePath : EditablePath, IHasContextMenu
+    {
+        public MenuItem[] ContextMenuItems => getContextMenuItems().ToArray();
+
+        // To handle when the editor is scrolled while dragging.
+        private Vector2 dragStartPosition;
+
+        [Resolved(CanBeNull = true)]
+        [CanBeNull]
+        private IEditorChangeHandler changeHandler { get; set; }
+
+        public SelectionEditablePath(Func<float, double> positionToDistance)
+            : base(positionToDistance)
+        {
+        }
+
+        public void AddVertex(Vector2 relativePosition)
+        {
+            double distance = Math.Max(0, PositionToDistance(relativePosition.Y));
+            int index = AddVertex(distance, relativePosition.X);
+            selectOnly(index);
+        }
+
+        public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) => InternalChildren.Any(d => d.ReceivePositionalInputAt(screenSpacePos));
+
+        protected override bool OnMouseDown(MouseDownEvent e)
+        {
+            int index = getMouseTargetVertex(e.ScreenSpaceMouseDownPosition);
+            if (index == -1 || VertexStates[index].IsFixed)
+                return false;
+
+            if (e.Button == MouseButton.Left && e.ShiftPressed)
+            {
+                RemoveVertex(index);
+                return true;
+            }
+
+            if (e.ControlPressed)
+                VertexStates[index].IsSelected = !VertexStates[index].IsSelected;
+            else if (!VertexStates[index].IsSelected)
+                selectOnly(index);
+
+            // Don't inhibit right click, to show the context menu
+            return e.Button != MouseButton.Right;
+        }
+
+        protected override bool OnDragStart(DragStartEvent e)
+        {
+            int index = getMouseTargetVertex(e.ScreenSpaceMouseDownPosition);
+            if (index == -1 || VertexStates[index].IsFixed)
+                return false;
+
+            if (e.Button != MouseButton.Left)
+                return false;
+
+            dragStartPosition = ToRelativePosition(e.ScreenSpaceMouseDownPosition);
+
+            for (int i = 0; i < VertexCount; i++)
+                VertexStates[i].VertexBeforeChange = Vertices[i];
+
+            changeHandler?.BeginChange();
+            return true;
+        }
+
+        protected override void OnDrag(DragEvent e)
+        {
+            Vector2 mousePosition = ToRelativePosition(e.ScreenSpaceMousePosition);
+            double distanceDelta = PositionToDistance(mousePosition.Y) - PositionToDistance(dragStartPosition.Y);
+            float xDelta = mousePosition.X - dragStartPosition.X;
+            MoveSelectedVertices(distanceDelta, xDelta);
+        }
+
+        protected override void OnDragEnd(DragEndEvent e)
+        {
+            changeHandler?.EndChange();
+        }
+
+        private int getMouseTargetVertex(Vector2 screenSpacePosition)
+        {
+            for (int i = InternalChildren.Count - 1; i >= 0; i--)
+            {
+                if (i < VertexCount && InternalChildren[i].ReceivePositionalInputAt(screenSpacePosition))
+                    return i;
+            }
+
+            return -1;
+        }
+
+        private IEnumerable<MenuItem> getContextMenuItems()
+        {
+            int selectedCount = VertexStates.Count(state => state.IsSelected);
+
+            if (selectedCount != 0)
+                yield return new OsuMenuItem($"Delete selected {(selectedCount == 1 ? "vertex" : $"{selectedCount} vertices")}", MenuItemType.Destructive, deleteSelectedVertices);
+        }
+
+        private void selectOnly(int index)
+        {
+            for (int i = 0; i < VertexCount; i++)
+                VertexStates[i].IsSelected = i == index;
+        }
+
+        private void deleteSelectedVertices()
+        {
+            for (int i = VertexCount - 1; i >= 0; i--)
+            {
+                if (VertexStates[i].IsSelected)
+                    RemoveVertex(i);
+            }
+        }
+    }
+}

osu.Game.Rulesets.Catch/Edit/Blueprints/Components/VertexPiece.cs

@@ -0,0 +1,31 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Allocation;
+using osu.Framework.Extensions.Color4Extensions;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Shapes;
+using osu.Game.Graphics;
+using osuTK;
+
+namespace osu.Game.Rulesets.Catch.Edit.Blueprints.Components
+{
+    public class VertexPiece : Circle
+    {
+        [Resolved]
+        private OsuColour osuColour { get; set; }
+
+        public VertexPiece()
+        {
+            Anchor = Anchor.BottomLeft;
+            Origin = Anchor.Centre;
+            Size = new Vector2(15);
+        }
+
+        public void UpdateFrom(VertexState state)
+        {
+            Colour = state.IsSelected ? osuColour.Yellow.Lighten(1) : osuColour.Yellow;
+            Alpha = state.IsFixed ? 0.5f : 1;
+        }
+    }
+}

osu.Game.Rulesets.Catch/Edit/Blueprints/Components/VertexState.cs

@@ -0,0 +1,31 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Game.Rulesets.Catch.Objects;
+
+#nullable enable
+
+namespace osu.Game.Rulesets.Catch.Edit.Blueprints.Components
+{
+    /// <summary>
+    /// Holds the state of a vertex in the path of a <see cref="EditablePath"/>.
+    /// </summary>
+    public class VertexState
+    {
+        /// <summary>
+        /// Whether the vertex is selected.
+        /// </summary>
+        public bool IsSelected { get; set; }
+
+        /// <summary>
+        /// Whether the vertex can be moved or deleted.
+        /// </summary>
+        public bool IsFixed { get; set; }
+
+        /// <summary>
+        /// The position of the vertex before a vertex moving operation starts.
+        /// This is used to implement "memory-less" moving operations (only the final position matters) to improve UX.
+        /// </summary>
+        public JuiceStreamPathVertex VertexBeforeChange { get; set; }
+    }
+}

osu.Game.Rulesets.Catch/Edit/Blueprints/JuiceStreamPlacementBlueprint.cs

@@ -0,0 +1,128 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Graphics;
+using osu.Framework.Input;
+using osu.Framework.Input.Events;
+using osu.Game.Rulesets.Catch.Edit.Blueprints.Components;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Edit;
+using osuTK;
+using osuTK.Input;
+
+namespace osu.Game.Rulesets.Catch.Edit.Blueprints
+{
+    public class JuiceStreamPlacementBlueprint : CatchPlacementBlueprint<JuiceStream>
+    {
+        private readonly ScrollingPath scrollingPath;
+
+        private readonly NestedOutlineContainer nestedOutlineContainer;
+
+        private readonly PlacementEditablePath editablePath;
+
+        private int lastEditablePathId = -1;
+
+        private InputManager inputManager;
+
+        public JuiceStreamPlacementBlueprint()
+        {
+            InternalChildren = new Drawable[]
+            {
+                scrollingPath = new ScrollingPath(),
+                nestedOutlineContainer = new NestedOutlineContainer(),
+                editablePath = new PlacementEditablePath(positionToDistance)
+            };
+        }
+
+        protected override void Update()
+        {
+            base.Update();
+
+            if (PlacementActive == PlacementState.Active)
+                editablePath.UpdateFrom(HitObjectContainer, HitObject);
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            inputManager = GetContainingInputManager();
+        }
+
+        protected override bool OnMouseDown(MouseDownEvent e)
+        {
+            switch (PlacementActive)
+            {
+                case PlacementState.Waiting:
+                    if (e.Button != MouseButton.Left) break;
+
+                    editablePath.AddNewVertex();
+                    BeginPlacement(true);
+                    return true;
+
+                case PlacementState.Active:
+                    switch (e.Button)
+                    {
+                        case MouseButton.Left:
+                            editablePath.AddNewVertex();
+                            return true;
+
+                        case MouseButton.Right:
+                            EndPlacement(HitObject.Duration > 0);
+                            return true;
+                    }
+
+                    break;
+            }
+
+            return base.OnMouseDown(e);
+        }
+
+        public override void UpdateTimeAndPosition(SnapResult result)
+        {
+            switch (PlacementActive)
+            {
+                case PlacementState.Waiting:
+                    if (!(result.Time is double snappedTime)) return;
+
+                    HitObject.OriginalX = ToLocalSpace(result.ScreenSpacePosition).X;
+                    HitObject.StartTime = snappedTime;
+                    break;
+
+                case PlacementState.Active:
+                    Vector2 unsnappedPosition = inputManager.CurrentState.Mouse.Position;
+                    editablePath.MoveLastVertex(unsnappedPosition);
+                    break;
+
+                default:
+                    return;
+            }
+
+            // Make sure the up-to-date position is used for outlines.
+            Vector2 startPosition = CatchHitObjectUtils.GetStartPosition(HitObjectContainer, HitObject);
+            editablePath.Position = nestedOutlineContainer.Position = scrollingPath.Position = startPosition;
+
+            updateHitObjectFromPath();
+        }
+
+        private void updateHitObjectFromPath()
+        {
+            if (lastEditablePathId == editablePath.PathId)
+                return;
+
+            editablePath.UpdateHitObjectFromPath(HitObject);
+            ApplyDefaultsToHitObject();
+
+            scrollingPath.UpdatePathFrom(HitObjectContainer, HitObject);
+            nestedOutlineContainer.UpdateNestedObjectsFrom(HitObjectContainer, HitObject);
+
+            lastEditablePathId = editablePath.PathId;
+        }
+
+        private double positionToDistance(float relativeYPosition)
+        {
+            double time = HitObjectContainer.TimeAtPosition(relativeYPosition, HitObject.StartTime);
+            return (time - HitObject.StartTime) * HitObject.Velocity;
+        }
+    }
+}

osu.Game.Rulesets.Catch/Edit/Blueprints/JuiceStreamSelectionBlueprint.cs

@@ -1,15 +1,22 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using System.Collections.Generic;
 using System.Linq;
+using JetBrains.Annotations;
 using osu.Framework.Allocation;
 using osu.Framework.Caching;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Primitives;
+using osu.Framework.Graphics.UserInterface;
+using osu.Framework.Input.Events;
+using osu.Game.Graphics.UserInterface;
 using osu.Game.Rulesets.Catch.Edit.Blueprints.Components;
 using osu.Game.Rulesets.Catch.Objects;
 using osu.Game.Rulesets.Objects;
+using osu.Game.Screens.Edit;
 using osuTK;
+using osuTK.Input;
 
 namespace osu.Game.Rulesets.Catch.Edit.Blueprints
 {
@@ -17,6 +24,8 @@ namespace osu.Game.Rulesets.Catch.Edit.Blueprints
     {
         public override Quad SelectionQuad => HitObjectContainer.ToScreenSpace(getBoundingBox().Offset(new Vector2(0, HitObjectContainer.DrawHeight)));
 
+        public override MenuItem[] ContextMenuItems => getContextMenuItems().ToArray();
+
         private float minNestedX;
         private float maxNestedX;
 
@@ -26,13 +35,34 @@ namespace osu.Game.Rulesets.Catch.Edit.Blueprints
 
         private readonly Cached pathCache = new Cached();
 
+        private readonly SelectionEditablePath editablePath;
+
+        /// <summary>
+        /// The <see cref="JuiceStreamPath.InvalidationID"/> of the <see cref="JuiceStreamPath"/> corresponding the current <see cref="SliderPath"/> of the hit object.
+        /// When the path is edited, the change is detected and the <see cref="SliderPath"/> of the hit object is updated.
+        /// </summary>
+        private int lastEditablePathId = -1;
+
+        /// <summary>
+        /// The <see cref="SliderPath.Version"/> of the current <see cref="SliderPath"/> of the hit object.
+        /// When the <see cref="SliderPath"/> of the hit object is changed by external means, the change is detected and the <see cref="JuiceStreamPath"/> is re-initialized.
+        /// </summary>
+        private int lastSliderPathVersion = -1;
+
+        private Vector2 rightMouseDownPosition;
+
+        [Resolved(CanBeNull = true)]
+        [CanBeNull]
+        private EditorBeatmap editorBeatmap { get; set; }
+
         public JuiceStreamSelectionBlueprint(JuiceStream hitObject)
             : base(hitObject)
         {
             InternalChildren = new Drawable[]
             {
                 scrollingPath = new ScrollingPath(),
-                nestedOutlineContainer = new NestedOutlineContainer()
+                nestedOutlineContainer = new NestedOutlineContainer(),
+                editablePath = new SelectionEditablePath(positionToDistance)
             };
         }
 
@@ -49,7 +79,13 @@ namespace osu.Game.Rulesets.Catch.Edit.Blueprints
 
             if (!IsSelected) return;
 
-            nestedOutlineContainer.Position = scrollingPath.Position = CatchHitObjectUtils.GetStartPosition(HitObjectContainer, HitObject);
+            if (editablePath.PathId != lastEditablePathId)
+                updateHitObjectFromPath();
+
+            Vector2 startPosition = CatchHitObjectUtils.GetStartPosition(HitObjectContainer, HitObject);
+            editablePath.Position = nestedOutlineContainer.Position = scrollingPath.Position = startPosition;
+
+            editablePath.UpdateFrom(HitObjectContainer, HitObject);
 
             if (pathCache.IsValid) return;
 
@@ -59,10 +95,38 @@ namespace osu.Game.Rulesets.Catch.Edit.Blueprints
             pathCache.Validate();
         }
 
+        protected override void OnSelected()
+        {
+            initializeJuiceStreamPath();
+            base.OnSelected();
+        }
+
+        protected override bool OnMouseDown(MouseDownEvent e)
+        {
+            if (!IsSelected) return base.OnMouseDown(e);
+
+            switch (e.Button)
+            {
+                case MouseButton.Left when e.ControlPressed:
+                    editablePath.AddVertex(editablePath.ToRelativePosition(e.ScreenSpaceMouseDownPosition));
+                    return true;
+
+                case MouseButton.Right:
+                    // Record the mouse position to be used in the "add vertex" action.
+                    rightMouseDownPosition = editablePath.ToRelativePosition(e.ScreenSpaceMouseDownPosition);
+                    break;
+            }
+
+            return base.OnMouseDown(e);
+        }
+
         private void onDefaultsApplied(HitObject _)
         {
             computeObjectBounds();
             pathCache.Invalidate();
+
+            if (lastSliderPathVersion != HitObject.Path.Version.Value)
+                initializeJuiceStreamPath();
         }
 
         private void computeObjectBounds()
@@ -81,6 +145,38 @@ namespace osu.Game.Rulesets.Catch.Edit.Blueprints
             return new RectangleF(left, top, right - left, bottom - top).Inflate(objectRadius);
         }
 
+        private double positionToDistance(float relativeYPosition)
+        {
+            double time = HitObjectContainer.TimeAtPosition(relativeYPosition, HitObject.StartTime);
+            return (time - HitObject.StartTime) * HitObject.Velocity;
+        }
+
+        private void initializeJuiceStreamPath()
+        {
+            editablePath.InitializeFromHitObject(HitObject);
+
+            // Record the current ID to update the hit object only when a change is made to the path.
+            lastEditablePathId = editablePath.PathId;
+            lastSliderPathVersion = HitObject.Path.Version.Value;
+        }
+
+        private void updateHitObjectFromPath()
+        {
+            editablePath.UpdateHitObjectFromPath(HitObject);
+            editorBeatmap?.Update(HitObject);
+
+            lastEditablePathId = editablePath.PathId;
+            lastSliderPathVersion = HitObject.Path.Version.Value;
+        }
+
+        private IEnumerable<MenuItem> getContextMenuItems()
+        {
+            yield return new OsuMenuItem("Add vertex", MenuItemType.Standard, () =>
+            {
+                editablePath.AddVertex(rightMouseDownPosition);
+            });
+        }
+
         protected override void Dispose(bool isDisposing)
         {
             base.Dispose(isDisposing);

osu.Game.Rulesets.Catch/Edit/CatchBeatmapVerifier.cs

@@ -0,0 +1,24 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Linq;
+using osu.Game.Rulesets.Catch.Edit.Checks;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Edit.Checks.Components;
+
+namespace osu.Game.Rulesets.Catch.Edit
+{
+    public class CatchBeatmapVerifier : IBeatmapVerifier
+    {
+        private readonly List<ICheck> checks = new List<ICheck>
+        {
+            new CheckBananaShowerGap()
+        };
+
+        public IEnumerable<Issue> Run(BeatmapVerifierContext context)
+        {
+            return checks.SelectMany(check => check.Run(context));
+        }
+    }
+}

osu.Game.Rulesets.Catch/Edit/CatchDistanceSnapGrid.cs

@@ -0,0 +1,141 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using JetBrains.Annotations;
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Lines;
+using osu.Framework.Graphics.Primitives;
+using osu.Game.Rulesets.Catch.UI;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.UI;
+using osu.Game.Rulesets.UI.Scrolling;
+using osuTK;
+
+namespace osu.Game.Rulesets.Catch.Edit
+{
+    /// <summary>
+    /// The guide lines used in the osu!catch editor to compose patterns that can be caught with constant speed.
+    /// Currently, only forward placement (an object is snapped based on the previous object, not the opposite) is supported.
+    /// </summary>
+    public class CatchDistanceSnapGrid : CompositeDrawable
+    {
+        public double StartTime { get; set; }
+
+        public float StartX { get; set; }
+
+        private const double max_vertical_line_length_in_time = CatchPlayfield.WIDTH / Catcher.BASE_WALK_SPEED;
+
+        private readonly double[] velocities;
+
+        private readonly List<Path> verticalPaths = new List<Path>();
+
+        private readonly List<Vector2[]> verticalLineVertices = new List<Vector2[]>();
+
+        [Resolved]
+        private Playfield playfield { get; set; }
+
+        private ScrollingHitObjectContainer hitObjectContainer => (ScrollingHitObjectContainer)playfield.HitObjectContainer;
+
+        public CatchDistanceSnapGrid(double[] velocities)
+        {
+            RelativeSizeAxes = Axes.Both;
+            Anchor = Anchor.BottomLeft;
+
+            this.velocities = velocities;
+
+            for (int i = 0; i < velocities.Length; i++)
+            {
+                verticalPaths.Add(new SmoothPath
+                {
+                    PathRadius = 2,
+                    Alpha = 0.5f,
+                });
+
+                verticalLineVertices.Add(new[] { Vector2.Zero, Vector2.Zero });
+            }
+
+            AddRangeInternal(verticalPaths);
+        }
+
+        protected override void Update()
+        {
+            base.Update();
+
+            double currentTime = hitObjectContainer.Time.Current;
+
+            for (int i = 0; i < velocities.Length; i++)
+            {
+                double velocity = velocities[i];
+
+                // The line ends at the top of the playfield.
+                double endTime = hitObjectContainer.TimeAtPosition(-hitObjectContainer.DrawHeight, currentTime);
+
+                // Non-vertical lines are cut at the sides of the playfield.
+                // Vertical lines are cut at some reasonable length.
+                if (velocity > 0)
+                    endTime = Math.Min(endTime, StartTime + (CatchPlayfield.WIDTH - StartX) / velocity);
+                else if (velocity < 0)
+                    endTime = Math.Min(endTime, StartTime + StartX / -velocity);
+                else
+                    endTime = Math.Min(endTime, StartTime + max_vertical_line_length_in_time);
+
+                Vector2[] lineVertices = verticalLineVertices[i];
+                lineVertices[0] = calculatePosition(velocity, StartTime);
+                lineVertices[1] = calculatePosition(velocity, endTime);
+
+                var verticalPath = verticalPaths[i];
+                verticalPath.Vertices = verticalLineVertices[i];
+                verticalPath.OriginPosition = verticalPath.PositionInBoundingBox(Vector2.Zero);
+            }
+
+            Vector2 calculatePosition(double velocity, double time)
+            {
+                // Don't draw inverted lines.
+                time = Math.Max(time, StartTime);
+
+                float x = StartX + (float)((time - StartTime) * velocity);
+                float y = hitObjectContainer.PositionAtTime(time, currentTime);
+                return new Vector2(x, y);
+            }
+        }
+
+        [CanBeNull]
+        public SnapResult GetSnappedPosition(Vector2 screenSpacePosition)
+        {
+            double time = hitObjectContainer.TimeAtScreenSpacePosition(screenSpacePosition);
+
+            // If the cursor is below the distance snap grid, snap to the origin.
+            // Not returning `null` to retain the continuous snapping behavior when the cursor is slightly below the origin.
+            // This behavior is not currently visible in the editor because editor chooses the snap start time based on the mouse position.
+            if (time <= StartTime)
+            {
+                float y = hitObjectContainer.PositionAtTime(StartTime);
+                Vector2 originPosition = hitObjectContainer.ToScreenSpace(new Vector2(StartX, y));
+                return new SnapResult(originPosition, StartTime);
+            }
+
+            return enumerateSnappingCandidates(time)
+                   .OrderBy(pos => Vector2.DistanceSquared(screenSpacePosition, pos.ScreenSpacePosition))
+                   .FirstOrDefault();
+        }
+
+        private IEnumerable<SnapResult> enumerateSnappingCandidates(double time)
+        {
+            float y = hitObjectContainer.PositionAtTime(time);
+
+            foreach (double velocity in velocities)
+            {
+                float x = (float)(StartX + (time - StartTime) * velocity);
+                Vector2 screenSpacePosition = hitObjectContainer.ToScreenSpace(new Vector2(x, y + hitObjectContainer.DrawHeight));
+                yield return new SnapResult(screenSpacePosition, time);
+            }
+        }
+
+        protected override bool ComputeIsMaskedAway(RectangleF maskingBounds) => false;
+    }
+}

osu.Game.Rulesets.Catch/Edit/CatchEditorPlayfield.cs

@@ -9,7 +9,7 @@ namespace osu.Game.Rulesets.Catch.Edit
     public class CatchEditorPlayfield : CatchPlayfield
     {
         // TODO fixme: the size of the catcher is not changed when circle size is changed in setup screen.
-        public CatchEditorPlayfield(BeatmapDifficulty difficulty)
+        public CatchEditorPlayfield(IBeatmapDifficultyInfo difficulty)
             : base(difficulty)
         {
         }
@@ -19,7 +19,7 @@ namespace osu.Game.Rulesets.Catch.Edit
             base.LoadComplete();
 
             // TODO: honor "hit animation" setting?
-            CatcherArea.MovableCatcher.CatchFruitOnPlate = false;
+            Catcher.CatchFruitOnPlate = false;
 
             // TODO: disable hit lighting as well
         }

osu.Game.Rulesets.Catch/Edit/CatchHitObjectComposer.cs

@@ -2,14 +2,23 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System.Collections.Generic;
+using System.Linq;
+using JetBrains.Annotations;
 using osu.Framework.Allocation;
+using osu.Framework.Bindables;
 using osu.Framework.Graphics;
+using osu.Framework.Graphics.Sprites;
+using osu.Framework.Input;
 using osu.Game.Beatmaps;
+using osu.Game.Graphics.UserInterface;
 using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Catch.UI;
 using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.Edit.Tools;
 using osu.Game.Rulesets.Mods;
+using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.UI;
+using osu.Game.Screens.Edit.Components.TernaryButtons;
 using osu.Game.Screens.Edit.Compose.Components;
 using osuTK;
 
@@ -17,6 +26,14 @@ namespace osu.Game.Rulesets.Catch.Edit
 {
     public class CatchHitObjectComposer : HitObjectComposer<CatchHitObject>
     {
+        private const float distance_snap_radius = 50;
+
+        private CatchDistanceSnapGrid distanceSnapGrid;
+
+        private readonly Bindable<TernaryState> distanceSnapToggle = new Bindable<TernaryState>();
+
+        private InputManager inputManager;
+
         public CatchHitObjectComposer(CatchRuleset ruleset)
             : base(ruleset)
         {
@@ -30,6 +47,27 @@ namespace osu.Game.Rulesets.Catch.Edit
                 RelativeSizeAxes = Axes.Both,
                 PlayfieldBorderStyle = { Value = PlayfieldBorderStyle.Corners }
             });
+
+            LayerBelowRuleset.Add(distanceSnapGrid = new CatchDistanceSnapGrid(new[]
+            {
+                0.0,
+                Catcher.BASE_DASH_SPEED, -Catcher.BASE_DASH_SPEED,
+                Catcher.BASE_WALK_SPEED, -Catcher.BASE_WALK_SPEED,
+            }));
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            inputManager = GetContainingInputManager();
+        }
+
+        protected override void Update()
+        {
+            base.Update();
+
+            updateDistanceSnapGrid();
         }
 
         protected override DrawableRuleset<CatchHitObject> CreateDrawableRuleset(Ruleset ruleset, IBeatmap beatmap, IReadOnlyList<Mod> mods = null) =>
@@ -38,17 +76,99 @@ namespace osu.Game.Rulesets.Catch.Edit
         protected override IReadOnlyList<HitObjectCompositionTool> CompositionTools => new HitObjectCompositionTool[]
         {
             new FruitCompositionTool(),
+            new JuiceStreamCompositionTool(),
             new BananaShowerCompositionTool()
         };
 
+        protected override IEnumerable<TernaryButton> CreateTernaryButtons() => base.CreateTernaryButtons().Concat(new[]
+        {
+            new TernaryButton(distanceSnapToggle, "Distance Snap", () => new SpriteIcon { Icon = FontAwesome.Solid.Ruler })
+        });
+
         public override SnapResult SnapScreenSpacePositionToValidTime(Vector2 screenSpacePosition)
         {
             var result = base.SnapScreenSpacePositionToValidTime(screenSpacePosition);
-            // TODO: implement position snap
             result.ScreenSpacePosition.X = screenSpacePosition.X;
+
+            if (distanceSnapGrid.IsPresent && distanceSnapGrid.GetSnappedPosition(result.ScreenSpacePosition) is SnapResult snapResult &&
+                Vector2.Distance(snapResult.ScreenSpacePosition, result.ScreenSpacePosition) < distance_snap_radius)
+            {
+                result = snapResult;
+            }
+
             return result;
         }
 
         protected override ComposeBlueprintContainer CreateBlueprintContainer() => new CatchBlueprintContainer(this);
+
+        [CanBeNull]
+        private PalpableCatchHitObject getLastSnappableHitObject(double time)
+        {
+            var hitObject = EditorBeatmap.HitObjects.OfType<CatchHitObject>().LastOrDefault(h => h.GetEndTime() < time && !(h is BananaShower));
+
+            switch (hitObject)
+            {
+                case Fruit fruit:
+                    return fruit;
+
+                case JuiceStream juiceStream:
+                    return juiceStream.NestedHitObjects.OfType<PalpableCatchHitObject>().LastOrDefault(h => !(h is TinyDroplet));
+
+                default:
+                    return null;
+            }
+        }
+
+        [CanBeNull]
+        private PalpableCatchHitObject getDistanceSnapGridSourceHitObject()
+        {
+            switch (BlueprintContainer.CurrentTool)
+            {
+                case SelectTool _:
+                    if (EditorBeatmap.SelectedHitObjects.Count == 0)
+                        return null;
+
+                    double minTime = EditorBeatmap.SelectedHitObjects.Min(hitObject => hitObject.StartTime);
+                    return getLastSnappableHitObject(minTime);
+
+                case FruitCompositionTool _:
+                case JuiceStreamCompositionTool _:
+                    if (!CursorInPlacementArea)
+                        return null;
+
+                    if (EditorBeatmap.PlacementObject.Value is JuiceStream)
+                    {
+                        // Juice stream path is not subject to snapping.
+                        return null;
+                    }
+
+                    double timeAtCursor = ((CatchPlayfield)Playfield).TimeAtScreenSpacePosition(inputManager.CurrentState.Mouse.Position);
+                    return getLastSnappableHitObject(timeAtCursor);
+
+                default:
+                    return null;
+            }
+        }
+
+        private void updateDistanceSnapGrid()
+        {
+            if (distanceSnapToggle.Value != TernaryState.True)
+            {
+                distanceSnapGrid.Hide();
+                return;
+            }
+
+            var sourceHitObject = getDistanceSnapGridSourceHitObject();
+
+            if (sourceHitObject == null)
+            {
+                distanceSnapGrid.Hide();
+                return;
+            }
+
+            distanceSnapGrid.Show();
+            distanceSnapGrid.StartTime = sourceHitObject.GetEndTime();
+            distanceSnapGrid.StartX = sourceHitObject.EffectiveX;
+        }
     }
 }

osu.Game.Rulesets.Catch/Edit/CatchHitObjectUtils.cs

@@ -1,7 +1,10 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using System.Collections.Generic;
+using System.Linq;
 using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Catch.UI;
 using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.UI.Scrolling;
 using osuTK;
@@ -20,5 +23,41 @@ namespace osu.Game.Rulesets.Catch.Edit
         {
             return new Vector2(hitObject.OriginalX, hitObjectContainer.PositionAtTime(hitObject.StartTime));
         }
+
+        /// <summary>
+        /// Get the range of horizontal position occupied by the hit object.
+        /// </summary>
+        /// <remarks>
+        /// <see cref="TinyDroplet"/>s are excluded and returns <see cref="PositionRange.EMPTY"/>.
+        /// </remarks>
+        public static PositionRange GetPositionRange(HitObject hitObject)
+        {
+            switch (hitObject)
+            {
+                case Fruit fruit:
+                    return new PositionRange(fruit.OriginalX);
+
+                case Droplet droplet:
+                    return droplet is TinyDroplet ? PositionRange.EMPTY : new PositionRange(droplet.OriginalX);
+
+                case JuiceStream _:
+                    return GetPositionRange(hitObject.NestedHitObjects);
+
+                case BananaShower _:
+                    // A banana shower occupies the whole screen width.
+                    return new PositionRange(0, CatchPlayfield.WIDTH);
+
+                default:
+                    return PositionRange.EMPTY;
+            }
+        }
+
+        /// <summary>
+        /// Get the range of horizontal position occupied by the hit objects.
+        /// </summary>
+        /// <remarks>
+        /// <see cref="TinyDroplet"/>s are excluded.
+        /// </remarks>
+        public static PositionRange GetPositionRange(IEnumerable<HitObject> hitObjects) => hitObjects.Select(GetPositionRange).Aggregate(PositionRange.EMPTY, PositionRange.Union);
     }
 }

osu.Game.Rulesets.Catch/Edit/CatchSelectionHandler.cs

@@ -12,6 +12,7 @@ using osu.Game.Rulesets.UI;
 using osu.Game.Rulesets.UI.Scrolling;
 using osu.Game.Screens.Edit.Compose.Components;
 using osuTK;
+using Direction = osu.Framework.Graphics.Direction;
 
 namespace osu.Game.Rulesets.Catch.Edit
 {
@@ -29,7 +30,7 @@ namespace osu.Game.Rulesets.Catch.Edit
             Vector2 targetPosition = HitObjectContainer.ToLocalSpace(blueprint.ScreenSpaceSelectionPoint + moveEvent.ScreenSpaceDelta);
 
             float deltaX = targetPosition.X - originalPosition.X;
-            deltaX = limitMovement(deltaX, EditorBeatmap.SelectedHitObjects);
+            deltaX = limitMovement(deltaX, SelectedItems);
 
             if (deltaX == 0)
             {
@@ -39,18 +40,60 @@ namespace osu.Game.Rulesets.Catch.Edit
 
             EditorBeatmap.PerformOnSelection(h =>
             {
-                if (!(h is CatchHitObject hitObject)) return;
+                if (!(h is CatchHitObject catchObject)) return;
 
-                hitObject.OriginalX += deltaX;
+                catchObject.OriginalX += deltaX;
 
                 // Move the nested hit objects to give an instant result before nested objects are recreated.
-                foreach (var nested in hitObject.NestedHitObjects.OfType<CatchHitObject>())
+                foreach (var nested in catchObject.NestedHitObjects.OfType<CatchHitObject>())
                     nested.OriginalX += deltaX;
             });
 
             return true;
         }
 
+        public override bool HandleFlip(Direction direction)
+        {
+            var selectionRange = CatchHitObjectUtils.GetPositionRange(SelectedItems);
+
+            bool changed = false;
+            EditorBeatmap.PerformOnSelection(h =>
+            {
+                if (h is CatchHitObject catchObject)
+                    changed |= handleFlip(selectionRange, catchObject);
+            });
+            return changed;
+        }
+
+        public override bool HandleReverse()
+        {
+            double selectionStartTime = SelectedItems.Min(h => h.StartTime);
+            double selectionEndTime = SelectedItems.Max(h => h.GetEndTime());
+
+            EditorBeatmap.PerformOnSelection(hitObject =>
+            {
+                hitObject.StartTime = selectionEndTime - (hitObject.GetEndTime() - selectionStartTime);
+
+                if (hitObject is JuiceStream juiceStream)
+                {
+                    juiceStream.Path.Reverse(out Vector2 positionalOffset);
+                    juiceStream.OriginalX += positionalOffset.X;
+                    juiceStream.LegacyConvertedY += positionalOffset.Y;
+                    EditorBeatmap.Update(juiceStream);
+                }
+            });
+            return true;
+        }
+
+        protected override void OnSelectionChanged()
+        {
+            base.OnSelectionChanged();
+
+            var selectionRange = CatchHitObjectUtils.GetPositionRange(SelectedItems);
+            SelectionBox.CanFlipX = selectionRange.Length > 0 && SelectedItems.Any(h => h is CatchHitObject && !(h is BananaShower));
+            SelectionBox.CanReverse = SelectedItems.Count > 1 || SelectedItems.Any(h => h is JuiceStream);
+        }
+
         /// <summary>
         /// Limit positional movement of the objects by the constraint that moved objects should stay in bounds.
         /// </summary>
@@ -59,20 +102,12 @@ namespace osu.Game.Rulesets.Catch.Edit
         /// <returns>The positional movement with the restriction applied.</returns>
         private float limitMovement(float deltaX, IEnumerable<HitObject> movingObjects)
         {
-            float minX = float.PositiveInfinity;
-            float maxX = float.NegativeInfinity;
-
-            foreach (float x in movingObjects.SelectMany(getOriginalPositions))
-            {
-                minX = Math.Min(minX, x);
-                maxX = Math.Max(maxX, x);
-            }
-
+            var range = CatchHitObjectUtils.GetPositionRange(movingObjects);
             // To make an object with position `x` stay in bounds after `deltaX` movement, `0 <= x + deltaX <= WIDTH` should be satisfied.
             // Subtracting `x`, we get `-x <= deltaX <= WIDTH - x`.
             // We only need to apply the inequality to extreme values of `x`.
-            float lowerBound = -minX;
-            float upperBound = CatchPlayfield.WIDTH - maxX;
+            float lowerBound = -range.Min;
+            float upperBound = CatchPlayfield.WIDTH - range.Max;
             // The inequality may be unsatisfiable if the objects were already out of bounds.
             // In that case, don't move objects at all.
             if (lowerBound > upperBound)
@@ -81,35 +116,25 @@ namespace osu.Game.Rulesets.Catch.Edit
             return Math.Clamp(deltaX, lowerBound, upperBound);
         }
 
-        /// <summary>
-        /// Enumerate X positions that should be contained in-bounds after move offset is applied.
-        /// </summary>
-        private IEnumerable<float> getOriginalPositions(HitObject hitObject)
+        private bool handleFlip(PositionRange selectionRange, CatchHitObject hitObject)
         {
             switch (hitObject)
             {
-                case Fruit fruit:
-                    yield return fruit.OriginalX;
-
-                    break;
+                case BananaShower _:
+                    return false;
 
                 case JuiceStream juiceStream:
-                    foreach (var nested in juiceStream.NestedHitObjects.OfType<CatchHitObject>())
-                    {
-                        // Even if `OriginalX` is outside the playfield, tiny droplets can be moved inside the playfield after the random offset application.
-                        if (!(nested is TinyDroplet))
-                            yield return nested.OriginalX;
-                    }
+                    juiceStream.OriginalX = selectionRange.GetFlippedPosition(juiceStream.OriginalX);
 
-                    break;
+                    foreach (var point in juiceStream.Path.ControlPoints)
+                        point.Position *= new Vector2(-1, 1);
 
-                case BananaShower _:
-                    // A banana shower occupies the whole screen width.
-                    // If the selection contains a banana shower, the selection cannot be moved horizontally.
-                    yield return 0;
-                    yield return CatchPlayfield.WIDTH;
+                    EditorBeatmap.Update(juiceStream);
+                    return true;
 
-                    break;
+                default:
+                    hitObject.OriginalX = selectionRange.GetFlippedPosition(hitObject.OriginalX);
+                    return true;
             }
         }
     }

osu.Game.Rulesets.Catch/Edit/Checks/CheckBananaShowerGap.cs

@@ -0,0 +1,102 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Collections.Generic;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Edit.Checks.Components;
+using osu.Game.Rulesets.Objects;
+
+namespace osu.Game.Rulesets.Catch.Edit.Checks
+{
+    /// <summary>
+    /// Check the spinner/banana shower gaps specified in the osu!catch difficulty specific ranking criteria.
+    /// </summary>
+    public class CheckBananaShowerGap : ICheck
+    {
+        private static readonly Dictionary<DifficultyRating, (int startGap, int endGap)> spinner_delta_threshold = new Dictionary<DifficultyRating, (int, int)>
+        {
+            [DifficultyRating.Easy] = (250, 250),
+            [DifficultyRating.Normal] = (250, 250),
+            [DifficultyRating.Hard] = (125, 250),
+            [DifficultyRating.Insane] = (125, 125),
+            [DifficultyRating.Expert] = (62, 125),
+            [DifficultyRating.ExpertPlus] = (62, 125)
+        };
+
+        public CheckMetadata Metadata { get; } = new CheckMetadata(CheckCategory.Compose, "Too short spinner gap");
+
+        public IEnumerable<IssueTemplate> PossibleTemplates => new IssueTemplate[]
+        {
+            new IssueTemplateBananaShowerStartGap(this),
+            new IssueTemplateBananaShowerEndGap(this)
+        };
+
+        public IEnumerable<Issue> Run(BeatmapVerifierContext context)
+        {
+            var hitObjects = context.Beatmap.HitObjects;
+            (int expectedStartDelta, int expectedEndDelta) = spinner_delta_threshold[context.InterpretedDifficulty];
+
+            for (int i = 0; i < hitObjects.Count - 1; ++i)
+            {
+                if (!(hitObjects[i] is BananaShower bananaShower))
+                    continue;
+
+                // Skip if the previous hitobject is a banana shower, consecutive spinners are allowed
+                if (i != 0 && hitObjects[i - 1] is CatchHitObject previousHitObject && !(previousHitObject is BananaShower))
+                {
+                    double spinnerStartDelta = bananaShower.StartTime - previousHitObject.GetEndTime();
+
+                    if (spinnerStartDelta < expectedStartDelta)
+                    {
+                        yield return new IssueTemplateBananaShowerStartGap(this)
+                            .Create(spinnerStartDelta, expectedStartDelta, bananaShower, previousHitObject);
+                    }
+                }
+
+                // Skip if the next hitobject is a banana shower, consecutive spinners are allowed
+                if (hitObjects[i + 1] is CatchHitObject nextHitObject && !(nextHitObject is BananaShower))
+                {
+                    double spinnerEndDelta = nextHitObject.StartTime - bananaShower.EndTime;
+
+                    if (spinnerEndDelta < expectedEndDelta)
+                    {
+                        yield return new IssueTemplateBananaShowerEndGap(this)
+                            .Create(spinnerEndDelta, expectedEndDelta, bananaShower, nextHitObject);
+                    }
+                }
+            }
+        }
+
+        public abstract class IssueTemplateBananaShowerGap : IssueTemplate
+        {
+            protected IssueTemplateBananaShowerGap(ICheck check, IssueType issueType, string unformattedMessage)
+                : base(check, issueType, unformattedMessage)
+            {
+            }
+
+            public Issue Create(double deltaTime, int expectedDeltaTime, params HitObject[] hitObjects)
+            {
+                return new Issue(hitObjects, this, Math.Floor(deltaTime), expectedDeltaTime);
+            }
+        }
+
+        public class IssueTemplateBananaShowerStartGap : IssueTemplateBananaShowerGap
+        {
+            public IssueTemplateBananaShowerStartGap(ICheck check)
+                : base(check, IssueType.Problem, "There is only {0} ms between the start of the spinner and the last object, it should not be less than {1} ms.")
+            {
+            }
+        }
+
+        public class IssueTemplateBananaShowerEndGap : IssueTemplateBananaShowerGap
+        {
+            public IssueTemplateBananaShowerEndGap(ICheck check)
+                : base(check, IssueType.Problem, "There is only {0} ms between the end of the spinner and the next object, it should not be less than {1} ms.")
+            {
+            }
+        }
+    }
+}

osu.Game.Rulesets.Catch/Edit/DrawableCatchEditorRuleset.cs

@@ -16,6 +16,6 @@ namespace osu.Game.Rulesets.Catch.Edit
         {
         }
 
-        protected override Playfield CreatePlayfield() => new CatchEditorPlayfield(Beatmap.BeatmapInfo.BaseDifficulty);
+        protected override Playfield CreatePlayfield() => new CatchEditorPlayfield(Beatmap.Difficulty);
     }
 }

osu.Game.Rulesets.Catch/Edit/JuiceStreamCompositionTool.cs

@@ -0,0 +1,24 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Graphics;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Catch.Edit.Blueprints;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Edit.Tools;
+
+namespace osu.Game.Rulesets.Catch.Edit
+{
+    public class JuiceStreamCompositionTool : HitObjectCompositionTool
+    {
+        public JuiceStreamCompositionTool()
+            : base(nameof(JuiceStream))
+        {
+        }
+
+        public override Drawable CreateIcon() => new BeatmapStatisticIcon(BeatmapStatisticsIconType.Sliders);
+
+        public override PlacementBlueprint CreatePlacementBlueprint() => new JuiceStreamPlacementBlueprint();
+    }
+}

osu.Game.Rulesets.Catch/Edit/PositionRange.cs

@@ -0,0 +1,42 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+
+#nullable enable
+
+namespace osu.Game.Rulesets.Catch.Edit
+{
+    /// <summary>
+    /// Represents either the empty range or a closed interval of horizontal positions in the playfield.
+    /// A <see cref="PositionRange"/> represents a closed interval if it is <see cref="Min"/> &lt;= <see cref="Max"/>, and represents the empty range otherwise.
+    /// </summary>
+    public readonly struct PositionRange
+    {
+        public readonly float Min;
+        public readonly float Max;
+
+        public float Length => Math.Max(0, Max - Min);
+
+        public PositionRange(float value)
+            : this(value, value)
+        {
+        }
+
+        public PositionRange(float min, float max)
+        {
+            Min = min;
+            Max = max;
+        }
+
+        public static PositionRange Union(PositionRange a, PositionRange b) => new PositionRange(Math.Min(a.Min, b.Min), Math.Max(a.Max, b.Max));
+
+        /// <summary>
+        /// Get the given position flipped (mirrored) for the axis at the center of this range.
+        /// Returns the given position unchanged if the range was empty.
+        /// </summary>
+        public float GetFlippedPosition(float x) => Min <= Max ? Max - (x - Min) : x;
+
+        public static readonly PositionRange EMPTY = new PositionRange(float.PositiveInfinity, float.NegativeInfinity);
+    }
+}

osu.Game.Rulesets.Catch/Mods/CatchModAutoplay.cs

@@ -3,10 +3,10 @@
 
 using System.Collections.Generic;
 using osu.Game.Beatmaps;
+using osu.Game.Online.API.Requests.Responses;
 using osu.Game.Rulesets.Catch.Replays;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Scoring;
-using osu.Game.Users;
 
 namespace osu.Game.Rulesets.Catch.Mods
 {
@@ -14,7 +14,7 @@ namespace osu.Game.Rulesets.Catch.Mods
     {
         public override Score CreateReplayScore(IBeatmap beatmap, IReadOnlyList<Mod> mods) => new Score
         {
-            ScoreInfo = new ScoreInfo { User = new User { Username = "osu!salad!" } },
+            ScoreInfo = new ScoreInfo { User = new APIUser { Username = "osu!salad" } },
             Replay = new CatchAutoGenerator(beatmap).Generate(),
         };
     }

osu.Game.Rulesets.Catch/Mods/CatchModCinema.cs

@@ -3,11 +3,11 @@
 
 using System.Collections.Generic;
 using osu.Game.Beatmaps;
+using osu.Game.Online.API.Requests.Responses;
 using osu.Game.Rulesets.Catch.Objects;
 using osu.Game.Rulesets.Catch.Replays;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Scoring;
-using osu.Game.Users;
 
 namespace osu.Game.Rulesets.Catch.Mods
 {
@@ -15,7 +15,7 @@ namespace osu.Game.Rulesets.Catch.Mods
     {
         public override Score CreateReplayScore(IBeatmap beatmap, IReadOnlyList<Mod> mods) => new Score
         {
-            ScoreInfo = new ScoreInfo { User = new User { Username = "osu!salad!" } },
+            ScoreInfo = new ScoreInfo { User = new APIUser { Username = "osu!salad" } },
             Replay = new CatchAutoGenerator(beatmap).Generate(),
         };
     }

osu.Game.Rulesets.Catch/Mods/CatchModFlashlight.cs

@@ -41,9 +41,7 @@ namespace osu.Game.Rulesets.Catch.Mods
             {
                 base.Update();
 
-                var catcherArea = playfield.CatcherArea;
-
-                FlashlightPosition = catcherArea.ToSpaceOfOtherDrawable(catcherArea.MovableCatcher.DrawPosition, this);
+                FlashlightPosition = playfield.CatcherArea.ToSpaceOfOtherDrawable(playfield.Catcher.DrawPosition, this);
             }
 
             private float getSizeFor(int combo)

osu.Game.Rulesets.Catch/Mods/CatchModHidden.cs

@@ -25,7 +25,7 @@ namespace osu.Game.Rulesets.Catch.Mods
             var drawableCatchRuleset = (DrawableCatchRuleset)drawableRuleset;
             var catchPlayfield = (CatchPlayfield)drawableCatchRuleset.Playfield;
 
-            catchPlayfield.CatcherArea.MovableCatcher.CatchFruitOnPlate = false;
+            catchPlayfield.Catcher.CatchFruitOnPlate = false;
         }
 
         protected override void ApplyIncreasedVisibilityState(DrawableHitObject hitObject, ArmedState state)
@@ -52,8 +52,8 @@ namespace osu.Game.Rulesets.Catch.Mods
         {
             var hitObject = drawable.HitObject;
 
-            var offset = hitObject.TimePreempt * fade_out_offset_multiplier;
-            var duration = offset - hitObject.TimePreempt * fade_out_duration_multiplier;
+            double offset = hitObject.TimePreempt * fade_out_offset_multiplier;
+            double duration = offset - hitObject.TimePreempt * fade_out_duration_multiplier;
 
             using (drawable.BeginAbsoluteSequence(hitObject.StartTime - offset))
                 drawable.FadeOut(duration);

osu.Game.Rulesets.Catch/Mods/CatchModMirror.cs

@@ -0,0 +1,87 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Linq;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Catch.Beatmaps;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Mods;
+using osu.Game.Rulesets.Catch.UI;
+using osu.Game.Rulesets.Objects;
+using osuTK;
+
+namespace osu.Game.Rulesets.Catch.Mods
+{
+    public class CatchModMirror : ModMirror, IApplicableToBeatmap
+    {
+        public override string Description => "Fruits are flipped horizontally.";
+
+        /// <remarks>
+        /// <see cref="IApplicableToBeatmap"/> is used instead of <see cref="IApplicableToHitObject"/>,
+        /// as <see cref="CatchBeatmapProcessor"/> applies offsets in <see cref="CatchBeatmapProcessor.PostProcess"/>.
+        /// <see cref="IApplicableToBeatmap"/> runs after post-processing, while <see cref="IApplicableToHitObject"/> runs before it.
+        /// </remarks>
+        public void ApplyToBeatmap(IBeatmap beatmap)
+        {
+            foreach (var hitObject in beatmap.HitObjects)
+                applyToHitObject(hitObject);
+        }
+
+        private void applyToHitObject(HitObject hitObject)
+        {
+            var catchObject = (CatchHitObject)hitObject;
+
+            switch (catchObject)
+            {
+                case Fruit fruit:
+                    mirrorEffectiveX(fruit);
+                    break;
+
+                case JuiceStream juiceStream:
+                    mirrorEffectiveX(juiceStream);
+                    mirrorJuiceStreamPath(juiceStream);
+                    break;
+
+                case BananaShower bananaShower:
+                    mirrorBananaShower(bananaShower);
+                    break;
+            }
+        }
+
+        /// <summary>
+        /// Mirrors the effective X position of <paramref name="catchObject"/> and its nested hit objects.
+        /// </summary>
+        private static void mirrorEffectiveX(CatchHitObject catchObject)
+        {
+            catchObject.OriginalX = CatchPlayfield.WIDTH - catchObject.OriginalX;
+            catchObject.XOffset = -catchObject.XOffset;
+
+            foreach (var nested in catchObject.NestedHitObjects.Cast<CatchHitObject>())
+            {
+                nested.OriginalX = CatchPlayfield.WIDTH - nested.OriginalX;
+                nested.XOffset = -nested.XOffset;
+            }
+        }
+
+        /// <summary>
+        /// Mirrors the path of the <paramref name="juiceStream"/>.
+        /// </summary>
+        private static void mirrorJuiceStreamPath(JuiceStream juiceStream)
+        {
+            var controlPoints = juiceStream.Path.ControlPoints.Select(p => new PathControlPoint(p.Position, p.Type)).ToArray();
+            foreach (var point in controlPoints)
+                point.Position = new Vector2(-point.Position.X, point.Position.Y);
+
+            juiceStream.Path = new SliderPath(controlPoints, juiceStream.Path.ExpectedDistance.Value);
+        }
+
+        /// <summary>
+        /// Mirrors X positions of all bananas in the <paramref name="bananaShower"/>.
+        /// </summary>
+        private static void mirrorBananaShower(BananaShower bananaShower)
+        {
+            foreach (var banana in bananaShower.NestedHitObjects.OfType<Banana>())
+                banana.XOffset = CatchPlayfield.WIDTH - banana.XOffset;
+        }
+    }
+}

osu.Game.Rulesets.Catch/Mods/CatchModMuted.cs

@@ -0,0 +1,12 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Mods;
+
+namespace osu.Game.Rulesets.Catch.Mods
+{
+    public class CatchModMuted : ModMuted<CatchHitObject>
+    {
+    }
+}

osu.Game.Rulesets.Catch/Mods/CatchModNoScope.cs

@@ -0,0 +1,40 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using osu.Framework.Bindables;
+using osu.Game.Rulesets.Mods;
+using osu.Framework.Utils;
+using osu.Game.Configuration;
+using osu.Game.Overlays.Settings;
+using osu.Game.Rulesets.Catch.UI;
+using osu.Game.Rulesets.UI;
+
+namespace osu.Game.Rulesets.Catch.Mods
+{
+    public class CatchModNoScope : ModNoScope, IUpdatableByPlayfield
+    {
+        public override string Description => "Where's the catcher?";
+
+        [SettingSource(
+            "Hidden at combo",
+            "The combo count at which the catcher becomes completely hidden",
+            SettingControlType = typeof(SettingsSlider<int, HiddenComboSlider>)
+        )]
+        public override BindableInt HiddenComboCount { get; } = new BindableInt
+        {
+            Default = 10,
+            Value = 10,
+            MinValue = 0,
+            MaxValue = 50,
+        };
+
+        public void Update(Playfield playfield)
+        {
+            var catchPlayfield = (CatchPlayfield)playfield;
+            bool shouldAlwaysShowCatcher = IsBreakTime.Value;
+            float targetAlpha = shouldAlwaysShowCatcher ? 1 : ComboBasedAlpha;
+            catchPlayfield.CatcherArea.Alpha = (float)Interpolation.Lerp(catchPlayfield.CatcherArea.Alpha, targetAlpha, Math.Clamp(catchPlayfield.Time.Elapsed / TRANSITION_DURATION, 0, 1));
+        }
+    }
+}

osu.Game.Rulesets.Catch/Mods/CatchModRelax.cs

@@ -44,9 +44,9 @@ namespace osu.Game.Rulesets.Catch.Mods
             }
 
             // disable keyboard controls
-            public bool OnPressed(CatchAction action) => true;
+            public bool OnPressed(KeyBindingPressEvent<CatchAction> e) => true;
 
-            public void OnReleased(CatchAction action)
+            public void OnReleased(KeyBindingReleaseEvent<CatchAction> e)
             {
             }
 

osu.Game.Rulesets.Catch/Objects/Banana.cs

@@ -9,6 +9,7 @@ using osu.Game.Audio;
 using osu.Game.Rulesets.Catch.Judgements;
 using osu.Game.Rulesets.Judgements;
 using osu.Game.Rulesets.Objects.Types;
+using osu.Game.Skinning;
 using osu.Game.Utils;
 using osuTK.Graphics;
 
@@ -31,7 +32,7 @@ namespace osu.Game.Rulesets.Catch.Objects
         }
 
         // override any external colour changes with banananana
-        Color4 IHasComboInformation.GetComboColour(IReadOnlyList<Color4> comboColours) => getBananaColour();
+        Color4 IHasComboInformation.GetComboColour(ISkin skin) => getBananaColour();
 
         private Color4 getBananaColour()
         {

osu.Game.Rulesets.Catch/Objects/CatchHitObject.cs

@@ -95,6 +95,14 @@ namespace osu.Game.Rulesets.Catch.Objects
             set => ComboIndexBindable.Value = value;
         }
 
+        public Bindable<int> ComboIndexWithOffsetsBindable { get; } = new Bindable<int>();
+
+        public int ComboIndexWithOffsets
+        {
+            get => ComboIndexWithOffsetsBindable.Value;
+            set => ComboIndexWithOffsetsBindable.Value = value;
+        }
+
         public Bindable<bool> LastInComboBindable { get; } = new Bindable<bool>();
 
         /// <summary>
@@ -120,11 +128,11 @@ namespace osu.Game.Rulesets.Catch.Objects
         /// </summary>
         public int RandomSeed => (int)StartTime;
 
-        protected override void ApplyDefaultsToSelf(ControlPointInfo controlPointInfo, BeatmapDifficulty difficulty)
+        protected override void ApplyDefaultsToSelf(ControlPointInfo controlPointInfo, IBeatmapDifficultyInfo difficulty)
         {
             base.ApplyDefaultsToSelf(controlPointInfo, difficulty);
 
-            TimePreempt = (float)BeatmapDifficulty.DifficultyRange(difficulty.ApproachRate, 1800, 1200, 450);
+            TimePreempt = (float)IBeatmapDifficultyInfo.DifficultyRange(difficulty.ApproachRate, 1800, 1200, 450);
 
             Scale = (1.0f - 0.7f * (difficulty.CircleSize - 5) / 5) / 2;
         }

osu.Game.Rulesets.Catch/Objects/JuiceStream.cs

@@ -37,14 +37,13 @@ namespace osu.Game.Rulesets.Catch.Objects
         /// </summary>
         public double SpanDuration => Duration / this.SpanCount();
 
-        protected override void ApplyDefaultsToSelf(ControlPointInfo controlPointInfo, BeatmapDifficulty difficulty)
+        protected override void ApplyDefaultsToSelf(ControlPointInfo controlPointInfo, IBeatmapDifficultyInfo difficulty)
         {
             base.ApplyDefaultsToSelf(controlPointInfo, difficulty);
 
             TimingControlPoint timingPoint = controlPointInfo.TimingPointAt(StartTime);
-            DifficultyControlPoint difficultyPoint = controlPointInfo.DifficultyPointAt(StartTime);
 
-            double scoringDistance = base_scoring_distance * difficulty.SliderMultiplier * difficultyPoint.SpeedMultiplier;
+            double scoringDistance = base_scoring_distance * difficulty.SliderMultiplier * DifficultyControlPoint.SliderVelocity;
 
             Velocity = scoringDistance / timingPoint.BeatLength;
             TickDistance = scoringDistance / difficulty.SliderTickRate;
@@ -138,7 +137,7 @@ namespace osu.Game.Rulesets.Catch.Objects
 
                 if (value != null)
                 {
-                    path.ControlPoints.AddRange(value.ControlPoints.Select(c => new PathControlPoint(c.Position.Value, c.Type.Value)));
+                    path.ControlPoints.AddRange(value.ControlPoints.Select(c => new PathControlPoint(c.Position, c.Type)));
                     path.ExpectedDistance.Value = value.ExpectedDistance.Value;
                 }
             }
@@ -146,7 +145,7 @@ namespace osu.Game.Rulesets.Catch.Objects
 
         public double Distance => Path.Distance;
 
-        public List<IList<HitSampleInfo>> NodeSamples { get; set; } = new List<IList<HitSampleInfo>>();
+        public IList<IList<HitSampleInfo>> NodeSamples { get; set; } = new List<IList<HitSampleInfo>>();
 
         public double? LegacyLastTickOffset { get; set; }
     }

osu.Game.Rulesets.Catch/Objects/JuiceStreamPath.cs

@@ -234,7 +234,7 @@ namespace osu.Game.Rulesets.Catch.Objects
 
             for (int i = 1; i < vertices.Count; i++)
             {
-                sliderPath.ControlPoints[^1].Type.Value = PathType.Linear;
+                sliderPath.ControlPoints[^1].Type = PathType.Linear;
 
                 float deltaX = vertices[i].X - lastPosition.X;
                 double length = vertices[i].Distance - currentDistance;

osu.Game.Rulesets.Catch/Objects/PalpableCatchHitObject.cs

@@ -1,10 +1,10 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-using System.Collections.Generic;
 using Newtonsoft.Json;
 using osu.Framework.Bindables;
 using osu.Game.Rulesets.Objects.Types;
+using osu.Game.Skinning;
 using osuTK.Graphics;
 
 namespace osu.Game.Rulesets.Catch.Objects
@@ -45,6 +45,6 @@ namespace osu.Game.Rulesets.Catch.Objects
             }
         }
 
-        Color4 IHasComboInformation.GetComboColour(IReadOnlyList<Color4> comboColours) => comboColours[(IndexInBeatmap + 1) % comboColours.Count];
+        Color4 IHasComboInformation.GetComboColour(ISkin skin) => IHasComboInformation.GetSkinComboColour(this, skin, IndexInBeatmap + 1);
     }
 }

osu.Game.Rulesets.Catch/Replays/CatchAutoGenerator.cs

@@ -26,9 +26,6 @@ namespace osu.Game.Rulesets.Catch.Replays
             if (Beatmap.HitObjects.Count == 0)
                 return;
 
-            // todo: add support for HT DT
-            const double dash_speed = Catcher.BASE_SPEED;
-            const double movement_speed = dash_speed / 2;
             float lastPosition = CatchPlayfield.CENTER_X;
             double lastTime = 0;
 
@@ -47,11 +44,11 @@ namespace osu.Game.Rulesets.Catch.Replays
                 // The case where positionChange > 0 and timeAvailable == 0 results in PositiveInfinity which provides expected beheaviour.
                 double speedRequired = positionChange == 0 ? 0 : positionChange / timeAvailable;
 
-                bool dashRequired = speedRequired > movement_speed;
-                bool impossibleJump = speedRequired > movement_speed * 2;
+                bool dashRequired = speedRequired > Catcher.BASE_WALK_SPEED;
+                bool impossibleJump = speedRequired > Catcher.BASE_DASH_SPEED;
 
                 // todo: get correct catcher size, based on difficulty CS.
-                const float catcher_width_half = CatcherArea.CATCHER_SIZE * 0.3f * 0.5f;
+                const float catcher_width_half = Catcher.BASE_SIZE * 0.3f * 0.5f;
 
                 if (lastPosition - catcher_width_half < h.EffectiveX && lastPosition + catcher_width_half > h.EffectiveX)
                 {
@@ -73,7 +70,7 @@ namespace osu.Game.Rulesets.Catch.Replays
                 else if (dashRequired)
                 {
                     // we do a movement in two parts - the dash part then the normal part...
-                    double timeAtNormalSpeed = positionChange / movement_speed;
+                    double timeAtNormalSpeed = positionChange / Catcher.BASE_WALK_SPEED;
                     double timeWeNeedToSave = timeAtNormalSpeed - timeAvailable;
                     double timeAtDashSpeed = timeWeNeedToSave / 2;
 
@@ -86,7 +83,7 @@ namespace osu.Game.Rulesets.Catch.Replays
                 }
                 else
                 {
-                    double timeBefore = positionChange / movement_speed;
+                    double timeBefore = positionChange / Catcher.BASE_WALK_SPEED;
 
                     addFrame(h.StartTime - timeBefore, lastPosition);
                     addFrame(h.StartTime, h.EffectiveX);

osu.Game.Rulesets.Catch/Replays/CatchFramedReplayInputHandler.cs

@@ -21,7 +21,7 @@ namespace osu.Game.Rulesets.Catch.Replays
 
         public override void CollectPendingInputs(List<IInput> inputs)
         {
-            var position = Interpolation.ValueAt(CurrentTime, StartFrame.Position, EndFrame.Position, StartFrame.Time, EndFrame.Time);
+            float position = Interpolation.ValueAt(CurrentTime, StartFrame.Position, EndFrame.Position, StartFrame.Time, EndFrame.Time);
 
             inputs.Add(new CatchReplayState
             {

osu.Game.Rulesets.Catch/Skinning/Default/DefaultHitExplosion.cs

@@ -0,0 +1,129 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Allocation;
+using osu.Framework.Extensions.Color4Extensions;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Effects;
+using osu.Framework.Utils;
+using osu.Game.Rulesets.Catch.UI;
+using osu.Game.Utils;
+using osuTK;
+using osuTK.Graphics;
+
+namespace osu.Game.Rulesets.Catch.Skinning.Default
+{
+    public class DefaultHitExplosion : CompositeDrawable, IHitExplosion
+    {
+        private CircularContainer largeFaint;
+        private CircularContainer smallFaint;
+        private CircularContainer directionalGlow1;
+        private CircularContainer directionalGlow2;
+
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            Size = new Vector2(20);
+            Anchor = Anchor.BottomCentre;
+            Origin = Anchor.BottomCentre;
+
+            // scale roughly in-line with visual appearance of notes
+            const float initial_height = 10;
+
+            InternalChildren = new Drawable[]
+            {
+                largeFaint = new CircularContainer
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    RelativeSizeAxes = Axes.Both,
+                    Masking = true,
+                    Blending = BlendingParameters.Additive,
+                },
+                smallFaint = new CircularContainer
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    RelativeSizeAxes = Axes.Both,
+                    Masking = true,
+                    Blending = BlendingParameters.Additive,
+                },
+                directionalGlow1 = new CircularContainer
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    RelativeSizeAxes = Axes.Both,
+                    Masking = true,
+                    Size = new Vector2(0.01f, initial_height),
+                    Blending = BlendingParameters.Additive,
+                },
+                directionalGlow2 = new CircularContainer
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    RelativeSizeAxes = Axes.Both,
+                    Masking = true,
+                    Size = new Vector2(0.01f, initial_height),
+                    Blending = BlendingParameters.Additive,
+                }
+            };
+        }
+
+        public void Animate(HitExplosionEntry entry)
+        {
+            X = entry.Position;
+            Scale = new Vector2(entry.HitObject.Scale);
+            setColour(entry.ObjectColour);
+
+            using (BeginAbsoluteSequence(entry.LifetimeStart))
+                applyTransforms(entry.HitObject.RandomSeed);
+        }
+
+        private void applyTransforms(int randomSeed)
+        {
+            const double duration = 400;
+
+            // we want our size to be very small so the glow dominates it.
+            largeFaint.Size = new Vector2(0.8f);
+            largeFaint
+                .ResizeTo(largeFaint.Size * new Vector2(5, 1), duration, Easing.OutQuint)
+                .FadeOut(duration * 2);
+
+            const float angle_variangle = 15; // should be less than 45
+            directionalGlow1.Rotation = StatelessRNG.NextSingle(-angle_variangle, angle_variangle, randomSeed, 4);
+            directionalGlow2.Rotation = StatelessRNG.NextSingle(-angle_variangle, angle_variangle, randomSeed, 5);
+
+            this.FadeInFromZero(50).Then().FadeOut(duration, Easing.Out);
+        }
+
+        private void setColour(Color4 objectColour)
+        {
+            const float roundness = 100;
+
+            largeFaint.EdgeEffect = new EdgeEffectParameters
+            {
+                Type = EdgeEffectType.Glow,
+                Colour = Interpolation.ValueAt(0.1f, objectColour, Color4.White, 0, 1).Opacity(0.3f),
+                Roundness = 160,
+                Radius = 200,
+            };
+
+            smallFaint.EdgeEffect = new EdgeEffectParameters
+            {
+                Type = EdgeEffectType.Glow,
+                Colour = Interpolation.ValueAt(0.6f, objectColour, Color4.White, 0, 1),
+                Roundness = 20,
+                Radius = 50,
+            };
+
+            directionalGlow1.EdgeEffect = directionalGlow2.EdgeEffect = new EdgeEffectParameters
+            {
+                Type = EdgeEffectType.Glow,
+                Colour = Interpolation.ValueAt(0.4f, objectColour, Color4.White, 0, 1),
+                Roundness = roundness,
+                Radius = 40,
+            };
+        }
+    }
+}

osu.Game.Rulesets.Catch/Skinning/Legacy/CatchLegacySkinTransformer.cs

@@ -66,17 +66,15 @@ namespace osu.Game.Rulesets.Catch.Skinning.Legacy
                         return null;
 
                     case CatchSkinComponents.Catcher:
-                        var version = GetConfig<LegacySkinConfiguration.LegacySetting, decimal>(LegacySkinConfiguration.LegacySetting.Version)?.Value ?? 1;
+                        decimal version = GetConfig<SkinConfiguration.LegacySetting, decimal>(SkinConfiguration.LegacySetting.Version)?.Value ?? 1;
 
                         if (version < 2.3m)
                         {
-                            if (GetTexture(@"fruit-ryuuta") != null ||
-                                GetTexture(@"fruit-ryuuta-0") != null)
+                            if (hasOldStyleCatcherSprite())
                                 return new LegacyCatcherOld();
                         }
 
-                        if (GetTexture(@"fruit-catcher-idle") != null ||
-                            GetTexture(@"fruit-catcher-idle-0") != null)
+                        if (hasNewStyleCatcherSprite())
                             return new LegacyCatcherNew();
 
                         return null;
@@ -86,12 +84,26 @@ namespace osu.Game.Rulesets.Catch.Skinning.Legacy
                             return new LegacyCatchComboCounter(Skin);
 
                         return null;
+
+                    case CatchSkinComponents.HitExplosion:
+                        if (hasOldStyleCatcherSprite() || hasNewStyleCatcherSprite())
+                            return new LegacyHitExplosion();
+
+                        return null;
                 }
             }
 
             return base.GetDrawableComponent(component);
         }
 
+        private bool hasOldStyleCatcherSprite() =>
+            GetTexture(@"fruit-ryuuta") != null
+            || GetTexture(@"fruit-ryuuta-0") != null;
+
+        private bool hasNewStyleCatcherSprite() =>
+            GetTexture(@"fruit-catcher-idle") != null
+            || GetTexture(@"fruit-catcher-idle-0") != null;
+
         public override IBindable<TValue> GetConfig<TLookup, TValue>(TLookup lookup)
         {
             switch (lookup)

osu.Game.Rulesets.Catch/Skinning/Legacy/LegacyHitExplosion.cs

@@ -0,0 +1,94 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Sprites;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Catch.UI;
+using osu.Game.Skinning;
+using osuTK;
+
+namespace osu.Game.Rulesets.Catch.Skinning.Legacy
+{
+    public class LegacyHitExplosion : CompositeDrawable, IHitExplosion
+    {
+        [Resolved]
+        private Catcher catcher { get; set; }
+
+        private const float catch_margin = (1 - Catcher.ALLOWED_CATCH_RANGE) / 2;
+
+        private readonly Sprite explosion1;
+        private readonly Sprite explosion2;
+
+        public LegacyHitExplosion()
+        {
+            Anchor = Anchor.BottomCentre;
+            Origin = Anchor.BottomCentre;
+            RelativeSizeAxes = Axes.Both;
+            Scale = new Vector2(0.5f);
+
+            InternalChildren = new[]
+            {
+                explosion1 = new Sprite
+                {
+                    Anchor = Anchor.BottomCentre,
+                    Origin = Anchor.CentreLeft,
+                    Alpha = 0,
+                    Blending = BlendingParameters.Additive,
+                    Rotation = -90
+                },
+                explosion2 = new Sprite
+                {
+                    Anchor = Anchor.BottomCentre,
+                    Origin = Anchor.CentreLeft,
+                    Alpha = 0,
+                    Blending = BlendingParameters.Additive,
+                    Rotation = -90
+                }
+            };
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(SkinManager skins)
+        {
+            var defaultLegacySkin = skins.DefaultLegacySkin;
+
+            // sprite names intentionally swapped to match stable member naming / ease of cross-referencing
+            explosion1.Texture = defaultLegacySkin.GetTexture("scoreboard-explosion-2");
+            explosion2.Texture = defaultLegacySkin.GetTexture("scoreboard-explosion-1");
+        }
+
+        public void Animate(HitExplosionEntry entry)
+        {
+            Colour = entry.ObjectColour;
+
+            using (BeginAbsoluteSequence(entry.LifetimeStart))
+            {
+                float halfCatchWidth = catcher.CatchWidth / 2;
+                float explosionOffset = Math.Clamp(entry.Position, -halfCatchWidth + catch_margin * 3, halfCatchWidth - catch_margin * 3);
+
+                if (!(entry.HitObject is Droplet))
+                {
+                    float scale = Math.Clamp(entry.JudgementResult.ComboAtJudgement / 200f, 0.35f, 1.125f);
+
+                    explosion1.Scale = new Vector2(1, 0.9f);
+                    explosion1.Position = new Vector2(explosionOffset, 0);
+
+                    explosion1.FadeOutFromOne(300);
+                    explosion1.ScaleTo(new Vector2(16 * scale, 1.1f), 160, Easing.Out);
+                }
+
+                explosion2.Scale = new Vector2(0.9f, 1);
+                explosion2.Position = new Vector2(explosionOffset, 0);
+
+                explosion2.FadeOutFromOne(700);
+                explosion2.ScaleTo(new Vector2(0.9f, 1.3f), 500, Easing.Out);
+
+                this.Delay(700).FadeOutFromOne();
+            }
+        }
+    }
+}

osu.Game.Rulesets.Catch/UI/CatchPlayfield.cs

@@ -26,38 +26,47 @@ namespace osu.Game.Rulesets.Catch.UI
         /// </summary>
         public const float CENTER_X = WIDTH / 2;
 
-        [Cached]
-        private readonly DroppedObjectContainer droppedObjectContainer;
-
-        internal readonly CatcherArea CatcherArea;
-
         public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) =>
             // only check the X position; handle all vertical space.
             base.ReceivePositionalInputAt(new Vector2(screenSpacePos.X, ScreenSpaceDrawQuad.Centre.Y));
 
-        public CatchPlayfield(BeatmapDifficulty difficulty)
-        {
-            CatcherArea = new CatcherArea(difficulty)
-            {
-                Anchor = Anchor.BottomLeft,
-                Origin = Anchor.TopLeft,
-            };
+        internal Catcher Catcher { get; private set; }
 
-            InternalChildren = new[]
-            {
-                droppedObjectContainer = new DroppedObjectContainer(),
-                CatcherArea.MovableCatcher.CreateProxiedContent(),
-                HitObjectContainer.CreateProxy(),
-                // This ordering (`CatcherArea` before `HitObjectContainer`) is important to
-                // make sure the up-to-date catcher position is used for the catcher catching logic of hit objects.
-                CatcherArea,
-                HitObjectContainer,
-            };
+        internal CatcherArea CatcherArea { get; private set; }
+
+        private readonly IBeatmapDifficultyInfo difficulty;
+
+        public CatchPlayfield(IBeatmapDifficultyInfo difficulty)
+        {
+            this.difficulty = difficulty;
         }
 
         [BackgroundDependencyLoader]
         private void load()
         {
+            var droppedObjectContainer = new DroppedObjectContainer();
+
+            Catcher = new Catcher(droppedObjectContainer, difficulty)
+            {
+                X = CENTER_X
+            };
+
+            AddRangeInternal(new[]
+            {
+                droppedObjectContainer,
+                Catcher.CreateProxiedContent(),
+                HitObjectContainer.CreateProxy(),
+                // This ordering (`CatcherArea` before `HitObjectContainer`) is important to
+                // make sure the up-to-date catcher position is used for the catcher catching logic of hit objects.
+                CatcherArea = new CatcherArea
+                {
+                    Anchor = Anchor.BottomLeft,
+                    Origin = Anchor.TopLeft,
+                    Catcher = Catcher,
+                },
+                HitObjectContainer,
+            });
+
             RegisterPool<Droplet, DrawableDroplet>(50);
             RegisterPool<TinyDroplet, DrawableTinyDroplet>(50);
             RegisterPool<Fruit, DrawableFruit>(100);
@@ -80,7 +89,7 @@ namespace osu.Game.Rulesets.Catch.UI
             ((DrawableCatchHitObject)d).CheckPosition = checkIfWeCanCatch;
         }
 
-        private bool checkIfWeCanCatch(CatchHitObject obj) => CatcherArea.MovableCatcher.CanCatch(obj);
+        private bool checkIfWeCanCatch(CatchHitObject obj) => Catcher.CanCatch(obj);
 
         private void onNewResult(DrawableHitObject judgedObject, JudgementResult result)
             => CatcherArea.OnNewResult((DrawableCatchHitObject)judgedObject, result);

osu.Game.Rulesets.Catch/UI/CatchReplayRecorder.cs

@@ -21,6 +21,6 @@ namespace osu.Game.Rulesets.Catch.UI
         }
 
         protected override ReplayFrame HandleFrame(Vector2 mousePosition, List<CatchAction> actions, ReplayFrame previousFrame)
-            => new CatchReplayFrame(Time.Current, playfield.CatcherArea.MovableCatcher.X, actions.Contains(CatchAction.Dash), previousFrame as CatchReplayFrame);
+            => new CatchReplayFrame(Time.Current, playfield.Catcher.X, actions.Contains(CatchAction.Dash), previousFrame as CatchReplayFrame);
     }
 }

osu.Game.Rulesets.Catch/UI/Catcher.cs

@@ -23,11 +23,21 @@ using osuTK.Graphics;
 
 namespace osu.Game.Rulesets.Catch.UI
 {
+    [Cached]
     public class Catcher : SkinReloadableDrawable
     {
         /// <summary>
-        /// The default colour used to tint hyper-dash fruit, along with the moving catcher, its trail
-        /// and end glow/after-image during a hyper-dash.
+        /// The size of the catcher at 1x scale.
+        /// </summary>
+        public const float BASE_SIZE = 106.75f;
+
+        /// <summary>
+        /// The width of the catcher which can receive fruit. Equivalent to "catchMargin" in osu-stable.
+        /// </summary>
+        public const float ALLOWED_CATCH_RANGE = 0.8f;
+
+        /// <summary>
+        /// The default colour used to tint hyper-dash fruit, along with the moving catcher, its trail and after-image during a hyper-dash.
         /// </summary>
         public static readonly Color4 DEFAULT_HYPER_DASH_COLOUR = Color4.Red;
 
@@ -47,25 +57,25 @@ namespace osu.Game.Rulesets.Catch.UI
         public bool CatchFruitOnPlate { get; set; } = true;
 
         /// <summary>
-        /// The relative space to cover in 1 millisecond. based on 1 game pixel per millisecond as in osu-stable.
+        /// The speed of the catcher when the catcher is dashing.
         /// </summary>
-        public const double BASE_SPEED = 1.0;
+        public const double BASE_DASH_SPEED = 1.0;
 
         /// <summary>
-        /// The current speed of the catcher.
+        /// The speed of the catcher when the catcher is not dashing.
         /// </summary>
-        public double Speed => (Dashing ? 1 : 0.5) * BASE_SPEED * hyperDashModifier;
+        public const double BASE_WALK_SPEED = 0.5;
+
+        /// <summary>
+        /// The current speed of the catcher with the hyper-dash modifier applied.
+        /// </summary>
+        public double Speed => (Dashing ? BASE_DASH_SPEED : BASE_WALK_SPEED) * hyperDashModifier;
 
         /// <summary>
         /// The amount by which caught fruit should be scaled down to fit on the plate.
         /// </summary>
         private const float caught_fruit_scale_adjust = 0.5f;
 
-        [NotNull]
-        private readonly Container trailsTarget;
-
-        private CatcherTrailDisplay trails;
-
         /// <summary>
         /// Contains caught objects on the plate.
         /// </summary>
@@ -74,40 +84,26 @@ namespace osu.Game.Rulesets.Catch.UI
         /// <summary>
         /// Contains objects dropped from the plate.
         /// </summary>
-        [Resolved]
-        private DroppedObjectContainer droppedObjectTarget { get; set; }
+        private readonly DroppedObjectContainer droppedObjectTarget;
 
         public CatcherAnimationState CurrentState
         {
-            get => Body.AnimationState.Value;
-            private set => Body.AnimationState.Value = value;
+            get => body.AnimationState.Value;
+            private set => body.AnimationState.Value = value;
         }
 
         /// <summary>
-        /// The width of the catcher which can receive fruit. Equivalent to "catchMargin" in osu-stable.
+        /// Whether the catcher is currently dashing.
         /// </summary>
-        public const float ALLOWED_CATCH_RANGE = 0.8f;
-
-        private bool dashing;
-
-        public bool Dashing
-        {
-            get => dashing;
-            set
-            {
-                if (value == dashing) return;
-
-                dashing = value;
-
-                updateTrailVisibility();
-            }
-        }
+        public bool Dashing { get; set; }
 
         /// <summary>
         /// The currently facing direction.
         /// </summary>
         public Direction VisualDirection { get; set; } = Direction.Right;
 
+        public Vector2 BodyScale => Scale * body.Scale;
+
         /// <summary>
         /// Whether the contents of the catcher plate should be visually flipped when the catcher direction is changed.
         /// </summary>
@@ -116,12 +112,11 @@ namespace osu.Game.Rulesets.Catch.UI
         /// <summary>
         /// Width of the area that can be used to attempt catches during gameplay.
         /// </summary>
-        private readonly float catchWidth;
+        public readonly float CatchWidth;
 
-        internal readonly SkinnableCatcher Body;
+        private readonly SkinnableCatcher body;
 
         private Color4 hyperDashColour = DEFAULT_HYPER_DASH_COLOUR;
-        private Color4 hyperDashEndGlowColour = DEFAULT_HYPER_DASH_COLOUR;
 
         private double hyperDashModifier = 1;
         private int hyperDashDirection;
@@ -134,17 +129,17 @@ namespace osu.Game.Rulesets.Catch.UI
         private readonly DrawablePool<CaughtBanana> caughtBananaPool;
         private readonly DrawablePool<CaughtDroplet> caughtDropletPool;
 
-        public Catcher([NotNull] Container trailsTarget, BeatmapDifficulty difficulty = null)
+        public Catcher([NotNull] DroppedObjectContainer droppedObjectTarget, IBeatmapDifficultyInfo difficulty = null)
         {
-            this.trailsTarget = trailsTarget;
+            this.droppedObjectTarget = droppedObjectTarget;
 
             Origin = Anchor.TopCentre;
 
-            Size = new Vector2(CatcherArea.CATCHER_SIZE);
+            Size = new Vector2(BASE_SIZE);
             if (difficulty != null)
                 Scale = calculateScale(difficulty);
 
-            catchWidth = CalculateCatchWidth(Scale);
+            CatchWidth = CalculateCatchWidth(Scale);
 
             InternalChildren = new Drawable[]
             {
@@ -159,7 +154,7 @@ namespace osu.Game.Rulesets.Catch.UI
                     // offset fruit vertically to better place "above" the plate.
                     Y = -5
                 },
-                Body = new SkinnableCatcher(),
+                body = new SkinnableCatcher(),
                 hitExplosionContainer = new HitExplosionContainer
                 {
                     Anchor = Anchor.TopCentre,
@@ -172,15 +167,6 @@ namespace osu.Game.Rulesets.Catch.UI
         private void load(OsuConfigManager config)
         {
             hitLighting = config.GetBindable<bool>(OsuSetting.HitLighting);
-            trails = new CatcherTrailDisplay(this);
-        }
-
-        protected override void LoadComplete()
-        {
-            base.LoadComplete();
-
-            // don't add in above load as we may potentially modify a parent in an unsafe manner.
-            trailsTarget.Add(trails);
         }
 
         /// <summary>
@@ -191,19 +177,19 @@ namespace osu.Game.Rulesets.Catch.UI
         /// <summary>
         /// Calculates the scale of the catcher based off the provided beatmap difficulty.
         /// </summary>
-        private static Vector2 calculateScale(BeatmapDifficulty difficulty) => new Vector2(1.0f - 0.7f * (difficulty.CircleSize - 5) / 5);
+        private static Vector2 calculateScale(IBeatmapDifficultyInfo difficulty) => new Vector2(1.0f - 0.7f * (difficulty.CircleSize - 5) / 5);
 
         /// <summary>
         /// Calculates the width of the area used for attempting catches in gameplay.
         /// </summary>
         /// <param name="scale">The scale of the catcher.</param>
-        public static float CalculateCatchWidth(Vector2 scale) => CatcherArea.CATCHER_SIZE * Math.Abs(scale.X) * ALLOWED_CATCH_RANGE;
+        public static float CalculateCatchWidth(Vector2 scale) => BASE_SIZE * Math.Abs(scale.X) * ALLOWED_CATCH_RANGE;
 
         /// <summary>
         /// Calculates the width of the area used for attempting catches in gameplay.
         /// </summary>
         /// <param name="difficulty">The beatmap difficulty.</param>
-        public static float CalculateCatchWidth(BeatmapDifficulty difficulty) => CalculateCatchWidth(calculateScale(difficulty));
+        public static float CalculateCatchWidth(IBeatmapDifficultyInfo difficulty) => CalculateCatchWidth(calculateScale(difficulty));
 
         /// <summary>
         /// Determine if this catcher can catch a <see cref="CatchHitObject"/> in the current position.
@@ -213,14 +199,9 @@ namespace osu.Game.Rulesets.Catch.UI
             if (!(hitObject is PalpableCatchHitObject fruit))
                 return false;
 
-            var halfCatchWidth = catchWidth * 0.5f;
-
-            // this stuff wil disappear once we move fruit to non-relative coordinate space in the future.
-            var catchObjectPosition = fruit.EffectiveX;
-            var catcherPosition = Position.X;
-
-            return catchObjectPosition >= catcherPosition - halfCatchWidth &&
-                   catchObjectPosition <= catcherPosition + halfCatchWidth;
+            float halfCatchWidth = CatchWidth * 0.5f;
+            return fruit.EffectiveX >= X - halfCatchWidth &&
+                   fruit.EffectiveX <= X + halfCatchWidth;
         }
 
         public void OnNewResult(DrawableCatchHitObject drawableObject, JudgementResult result)
@@ -241,7 +222,7 @@ namespace osu.Game.Rulesets.Catch.UI
                     placeCaughtObject(palpableObject, positionInStack);
 
                 if (hitLighting.Value)
-                    addLighting(hitObject, positionInStack.X, drawableObject.AccentColour.Value);
+                    addLighting(result, drawableObject.AccentColour.Value, positionInStack.X);
             }
 
             // droplet doesn't affect the catcher state
@@ -250,11 +231,11 @@ namespace osu.Game.Rulesets.Catch.UI
             if (result.IsHit && hitObject.HyperDash)
             {
                 var target = hitObject.HyperDashTarget;
-                var timeDifference = target.StartTime - hitObject.StartTime;
+                double timeDifference = target.StartTime - hitObject.StartTime;
                 double positionDifference = target.EffectiveX - X;
-                var velocity = positionDifference / Math.Max(1.0, timeDifference - 1000.0 / 60.0);
+                double velocity = positionDifference / Math.Max(1.0, timeDifference - 1000.0 / 60.0);
 
-                SetHyperDashState(Math.Abs(velocity), target.EffectiveX);
+                SetHyperDashState(Math.Abs(velocity) / BASE_DASH_SPEED, target.EffectiveX);
             }
             else
                 SetHyperDashState();
@@ -290,7 +271,7 @@ namespace osu.Game.Rulesets.Catch.UI
         /// <param name="targetPosition">When this catcher crosses this position, this catcher ends hyper-dashing.</param>
         public void SetHyperDashState(double modifier = 1, float targetPosition = -1)
         {
-            var wasHyperDashing = HyperDashing;
+            bool wasHyperDashing = HyperDashing;
 
             if (modifier <= 1 || X == targetPosition)
             {
@@ -307,10 +288,7 @@ namespace osu.Game.Rulesets.Catch.UI
                 hyperDashTargetPosition = targetPosition;
 
                 if (!wasHyperDashing)
-                {
-                    trails.DisplayEndGlow();
                     runHyperDashStateTransition(true);
-                }
             }
         }
 
@@ -326,13 +304,9 @@ namespace osu.Game.Rulesets.Catch.UI
 
         private void runHyperDashStateTransition(bool hyperDashing)
         {
-            updateTrailVisibility();
-
             this.FadeColour(hyperDashing ? hyperDashColour : Color4.White, HYPER_DASH_TRANSITION_DURATION, Easing.OutQuint);
         }
 
-        private void updateTrailVisibility() => trails.DisplayTrail = Dashing || HyperDashing;
-
         protected override void SkinChanged(ISkinSource skin)
         {
             base.SkinChanged(skin);
@@ -341,13 +315,6 @@ namespace osu.Game.Rulesets.Catch.UI
                 skin.GetConfig<CatchSkinColour, Color4>(CatchSkinColour.HyperDash)?.Value ??
                 DEFAULT_HYPER_DASH_COLOUR;
 
-            hyperDashEndGlowColour =
-                skin.GetConfig<CatchSkinColour, Color4>(CatchSkinColour.HyperDashAfterImage)?.Value ??
-                hyperDashColour;
-
-            trails.HyperDashTrailsColour = hyperDashColour;
-            trails.EndGlowSpritesColour = hyperDashEndGlowColour;
-
             flipCatcherPlate = skin.GetConfig<CatchSkinConfiguration, bool>(CatchSkinConfiguration.FlipCatcherPlate)?.Value ?? true;
 
             runHyperDashStateTransition(HyperDashing);
@@ -358,7 +325,7 @@ namespace osu.Game.Rulesets.Catch.UI
             base.Update();
 
             var scaleFromDirection = new Vector2((int)VisualDirection, 1);
-            Body.Scale = scaleFromDirection;
+            body.Scale = scaleFromDirection;
             caughtObjectContainer.Scale = hitExplosionContainer.Scale = flipCatcherPlate ? scaleFromDirection : Vector2.One;
 
             // Correct overshooting.
@@ -404,8 +371,8 @@ namespace osu.Game.Rulesets.Catch.UI
             return position;
         }
 
-        private void addLighting(CatchHitObject hitObject, float x, Color4 colour) =>
-            hitExplosionContainer.Add(new HitExplosionEntry(Time.Current, x, hitObject.Scale, colour, hitObject.RandomSeed));
+        private void addLighting(JudgementResult judgementResult, Color4 colour, float x) =>
+            hitExplosionContainer.Add(new HitExplosionEntry(Time.Current, judgementResult, colour, x));
 
         private CaughtObject getCaughtObject(PalpableCatchHitObject source)
         {