diff --git a/osu.Game.Rulesets.Catch.Tests/CatchDifficultyCalculatorTest.cs b/osu.Game.Rulesets.Catch.Tests/CatchDifficultyCalculatorTest.cs
new file mode 100644
index 0000000000..91bc537902
--- /dev/null
+++ b/osu.Game.Rulesets.Catch.Tests/CatchDifficultyCalculatorTest.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 NUnit.Framework;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Catch.Difficulty;
+using osu.Game.Rulesets.Difficulty;
+using osu.Game.Tests.Beatmaps;
+
+namespace osu.Game.Rulesets.Catch.Tests
+{
+    public class CatchDifficultyCalculatorTest : DifficultyCalculatorTest
+    {
+        protected override string ResourceAssembly => "osu.Game.Rulesets.Catch";
+
+        [TestCase(3.8664391043534758, "diffcalc-test")]
+        public void Test(double expected, string name)
+            => base.Test(expected, name);
+
+        protected override DifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new CatchDifficultyCalculator(new CatchRuleset(), beatmap);
+
+        protected override Ruleset CreateRuleset() => new CatchRuleset();
+    }
+}
diff --git a/osu.Game.Rulesets.Catch/Resources/Testing/Beatmaps/diffcalc-test.osu b/osu.Game.Rulesets.Catch/Resources/Testing/Beatmaps/diffcalc-test.osu
new file mode 100644
index 0000000000..ebad654404
--- /dev/null
+++ b/osu.Game.Rulesets.Catch/Resources/Testing/Beatmaps/diffcalc-test.osu
@@ -0,0 +1,138 @@
+osu file format v14
+
+[General]
+StackLeniency: 0.3
+Mode: 2
+
+[Difficulty]
+CircleSize:4
+OverallDifficulty:7
+ApproachRate:8.3
+SliderMultiplier:1.6
+SliderTickRate:1
+
+[TimingPoints]
+500,500,4,2,1,50,1,0
+34500,-50,4,2,1,50,0,0
+
+[HitObjects]
+// fruits spaced 1/1 beat apart
+32,128,0,5,0,0:0:0:0:
+96,128,500,1,0,0:0:0:0:
+160,128,1000,1,0,0:0:0:0:
+224,128,1500,1,0,0:0:0:0:
+288,128,2000,1,0,0:0:0:0:
+352,128,2500,1,0,0:0:0:0:
+416,128,3000,1,0,0:0:0:0:
+480,128,3500,1,0,0:0:0:0:
+
+// fruits spaced 1/2 beat apart
+32,160,4500,1,0,0:0:0:0:
+64,160,4750,1,0,0:0:0:0:
+96,160,5000,1,0,0:0:0:0:
+128,160,5250,1,0,0:0:0:0:
+160,160,5500,1,0,0:0:0:0:
+192,160,5750,1,0,0:0:0:0:
+224,160,6000,1,0,0:0:0:0:
+256,160,6250,1,0,0:0:0:0:
+288,160,6500,1,0,0:0:0:0:
+
+// fruits spaced 1/4 beat apart
+96,128,7500,1,0,0:0:0:0:
+128,128,7625,1,0,0:0:0:0:
+160,128,7750,1,0,0:0:0:0:
+192,128,7875,1,0,0:0:0:0:
+224,128,8000,1,0,0:0:0:0:
+256,128,8125,1,0,0:0:0:0:
+288,128,8250,1,0,0:0:0:0:
+320,128,8375,1,0,0:0:0:0:
+352,128,8500,1,0,0:0:0:0:
+
+// fruit hyperdashes, spaced 1/2 beat apart
+32,160,9500,1,0,0:0:0:0:
+480,160,9750,1,0,0:0:0:0:
+32,160,10000,1,0,0:0:0:0:
+480,160,10250,1,0,0:0:0:0:
+32,160,10500,1,0,0:0:0:0:
+480,160,10750,1,0,0:0:0:0:
+32,160,11000,1,0,0:0:0:0:
+
+// fruit hyperdashes, spaced 1/4 beat apart
+32,192,12000,1,0,0:0:0:0:
+480,192,12125,1,0,0:0:0:0:
+32,192,12250,1,0,0:0:0:0:
+480,192,12375,1,0,0:0:0:0:
+32,192,12500,1,0,0:0:0:0:
+480,192,12625,1,0,0:0:0:0:
+32,192,12750,1,0,0:0:0:0:
+480,192,12875,1,0,0:0:0:0:
+32,192,13000,1,0,0:0:0:0:
+
+// stream + hyperdash + stream, spaced 1/4 beat apart
+32,192,14000,1,0,0:0:0:0:
+64,192,14125,1,0,0:0:0:0:
+96,192,14250,1,0,0:0:0:0:
+128,192,14375,1,0,0:0:0:0:
+480,192,14500,1,0,0:0:0:0:
+448,192,14625,1,0,0:0:0:0:
+416,192,14750,1,0,0:0:0:0:
+384,192,14875,1,0,0:0:0:0:
+32,192,15000,1,0,0:0:0:0:
+
+// basic sliders
+32,192,16000,2,0,L|192:192,1,160
+224,192,17000,2,0,L|384:192,1,160
+416,192,17875,2,0,L|480:192,1,40
+
+// slider hyperdashes, spaced 1/4 beat apart
+32,192,19000,2,0,L|128:192,1,80
+480,192,19375,2,0,L|384:192,1,80
+352,192,19750,2,0,L|256:192,1,80
+0,192,20125,2,0,L|128:192,1,120
+
+// stream + slider hyperdashes, spaced 1/4 beat apart
+32,192,21500,1,0,0:0:0:0:
+64,192,21625,1,0,0:0:0:0:
+96,192,21750,1,0,0:0:0:0:
+512,192,21875,2,0,L|320:192,1,160
+320,192,22500,1,0,0:0:0:0:
+288,192,22625,1,0,0:0:0:0:
+256,192,22750,1,0,0:0:0:0:
+0,192,22875,2,0,L|64:192,1,40
+
+// streams, spaced 1/4 beat apart
+64,192,24000,1,0,0:0:0:0:
+160,192,24125,1,0,0:0:0:0:
+64,192,24250,1,0,0:0:0:0:
+160,192,24375,1,0,0:0:0:0:
+64,192,24500,1,0,0:0:0:0:
+160,192,24625,1,0,0:0:0:0:
+64,192,24750,1,0,0:0:0:0:
+160,192,24875,1,0,0:0:0:0:
+64,192,25000,1,0,0:0:0:0:
+160,192,25125,1,0,0:0:0:0:
+64,192,25250,1,0,0:0:0:0:
+160,192,25375,1,0,0:0:0:0:
+64,192,25500,1,0,0:0:0:0:
+
+// stream + spinner combo, spaced 1/4 beat apart
+256,192,26500,12,0,27000,0:0:0:0:
+128,192,27250,5,0,0:0:0:0:
+128,192,27375,1,0,0:0:0:0:
+160,192,27500,1,0,0:0:0:0:
+192,192,27625,1,0,0:0:0:0:
+256,192,27750,12,0,28500,0:0:0:0:
+192,192,28625,5,0,0:0:0:0:
+224,192,28750,1,0,0:0:0:0:
+256,192,28875,1,0,0:0:0:0:
+256,192,29000,1,0,0:0:0:0:
+256,192,29125,12,0,29500,0:0:0:0:
+
+// long slow slider
+0,192,30500,6,0,B|480:192|480:192|0:192,2,960
+
+// long fast slider
+0,192,37500,6,0,B|480:192|480:192|0:192,2,960
+
+// long hyperdash slider
+0,192,41500,2,0,P|544:192|544:192,5,480
diff --git a/osu.Game.Rulesets.Mania.Tests/ManiaDifficultyCalculatorTest.cs b/osu.Game.Rulesets.Mania.Tests/ManiaDifficultyCalculatorTest.cs
new file mode 100644
index 0000000000..05e2df796c
--- /dev/null
+++ b/osu.Game.Rulesets.Mania.Tests/ManiaDifficultyCalculatorTest.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 NUnit.Framework;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Difficulty;
+using osu.Game.Rulesets.Mania.Difficulty;
+using osu.Game.Tests.Beatmaps;
+
+namespace osu.Game.Rulesets.Mania.Tests
+{
+    public class ManiaDifficultyCalculatorTest : DifficultyCalculatorTest
+    {
+        protected override string ResourceAssembly => "osu.Game.Rulesets.Mania";
+
+        [TestCase(2.2676066895468976, "diffcalc-test")]
+        public void Test(double expected, string name)
+            => base.Test(expected, name);
+
+        protected override DifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new ManiaDifficultyCalculator(new ManiaRuleset(), beatmap);
+
+        protected override Ruleset CreateRuleset() => new ManiaRuleset();
+    }
+}
diff --git a/osu.Game.Rulesets.Mania/Resources/Testing/Beatmaps/diffcalc-test.osu b/osu.Game.Rulesets.Mania/Resources/Testing/Beatmaps/diffcalc-test.osu
new file mode 100644
index 0000000000..4c877c6193
--- /dev/null
+++ b/osu.Game.Rulesets.Mania/Resources/Testing/Beatmaps/diffcalc-test.osu
@@ -0,0 +1,180 @@
+osu file format v14
+
+[General]
+Mode: 3
+
+[Difficulty]
+CircleSize:4
+OverallDifficulty:7
+ApproachRate:8.3
+SliderMultiplier:1.6
+SliderTickRate:1
+
+[TimingPoints]
+500,500,4,2,1,50,1,0
+37500,-50,4,2,1,50,0,0
+41500,-25,4,2,1,50,0,0
+
+[HitObjects]
+// jacks spaced 1/1 beat apart
+64,192,0,1,0,0:0:0:0:
+64,192,500,1,0,0:0:0:0:
+64,192,1000,1,0,0:0:0:0:
+64,192,1500,1,0,0:0:0:0:
+64,192,2000,1,0,0:0:0:0:
+64,192,2500,1,0,0:0:0:0:
+
+// jacks spaced 1/2 beat apart
+64,192,3500,1,0,0:0:0:0:
+64,192,3750,1,0,0:0:0:0:
+64,192,4000,1,0,0:0:0:0:
+64,192,4250,1,0,0:0:0:0:
+64,192,4500,1,0,0:0:0:0:
+64,192,4750,1,0,0:0:0:0:
+64,192,5000,1,0,0:0:0:0:
+64,192,6000,1,0,0:0:0:0:
+
+// doubles jacks spaced 1/2 beat apart
+192,192,6000,1,0,0:0:0:0:
+64,192,6250,1,0,0:0:0:0:
+192,192,6250,1,0,0:0:0:0:
+64,192,6500,1,0,0:0:0:0:
+192,192,6500,1,0,0:0:0:0:
+64,192,6750,1,0,0:0:0:0:
+192,192,6750,1,0,0:0:0:0:
+64,192,7000,1,0,0:0:0:0:
+192,192,7000,1,0,0:0:0:0:
+64,192,7250,1,0,0:0:0:0:
+192,192,7250,1,0,0:0:0:0:
+64,192,7500,1,0,0:0:0:0:
+192,192,7500,1,0,0:0:0:0:
+
+// trill spaced 1/2 beat apart
+64,192,8500,1,0,0:0:0:0:
+192,192,8750,1,0,0:0:0:0:
+64,192,9000,1,0,0:0:0:0:
+192,192,9250,1,0,0:0:0:0:
+64,192,9500,1,0,0:0:0:0:
+192,192,9750,1,0,0:0:0:0:
+64,192,10000,1,0,0:0:0:0:
+192,192,10250,1,0,0:0:0:0:
+64,192,10500,1,0,0:0:0:0:
+
+// stair spaced 1/4 apart
+64,192,11500,1,0,0:0:0:0:
+192,192,11625,1,0,0:0:0:0:
+320,192,11750,1,0,0:0:0:0:
+448,192,11875,1,0,0:0:0:0:
+320,192,12000,1,0,0:0:0:0:
+192,192,12125,1,0,0:0:0:0:
+64,192,12250,1,0,0:0:0:0:
+192,192,12375,1,0,0:0:0:0:
+320,192,12500,1,0,0:0:0:0:
+448,192,12625,1,0,0:0:0:0:
+
+// jumpstreams?
+64,192,13500,1,0,0:0:0:0:
+192,192,13625,1,0,0:0:0:0:
+320,192,13750,1,0,0:0:0:0:
+448,192,13875,1,0,0:0:0:0:
+320,192,14000,1,0,0:0:0:0:
+192,192,14000,1,0,0:0:0:0:
+64,192,14125,1,0,0:0:0:0:
+192,192,14250,1,0,0:0:0:0:
+320,192,14250,1,0,0:0:0:0:
+448,192,14250,1,0,0:0:0:0:
+64,192,14375,1,0,0:0:0:0:
+64,192,14500,1,0,0:0:0:0:
+320,192,14625,1,0,0:0:0:0:
+448,192,14625,1,0,0:0:0:0:
+192,192,14625,1,0,0:0:0:0:
+192,192,14750,1,0,0:0:0:0:
+64,192,14875,1,0,0:0:0:0:
+192,192,15000,1,0,0:0:0:0:
+320,192,15125,1,0,0:0:0:0:
+448,192,15125,1,0,0:0:0:0:
+
+// double... jumps?
+64,192,16000,1,0,0:0:0:0:
+64,192,16250,1,0,0:0:0:0:
+192,192,16250,1,0,0:0:0:0:
+192,192,16500,1,0,0:0:0:0:
+320,192,16500,1,0,0:0:0:0:
+320,192,16750,1,0,0:0:0:0:
+448,192,16750,1,0,0:0:0:0:
+448,192,17000,1,0,0:0:0:0:
+
+// notes alongside hold
+64,192,18000,128,0,18500:0:0:0:0:
+192,192,18000,1,0,0:0:0:0:
+192,192,18250,1,0,0:0:0:0:
+192,192,18500,1,0,0:0:0:0:
+
+// notes overlapping hold
+64,192,19500,1,0,0:0:0:0:
+192,192,19625,128,0,20875:0:0:0:0:
+64,192,19750,1,0,0:0:0:0:
+64,192,20000,1,0,0:0:0:0:
+64,192,20250,1,0,0:0:0:0:
+64,192,20500,1,0,0:0:0:0:
+64,192,20750,1,0,0:0:0:0:
+64,192,21000,1,0,0:0:0:0:
+
+// simultaneous holds
+64,192,22000,128,0,23000:0:0:0:0:
+192,192,22000,128,0,23000:0:0:0:0:
+320,192,22000,128,0,23000:0:0:0:0:
+448,192,22000,128,0,23000:0:0:0:0:
+
+// hold stairs
+64,192,24500,128,0,25500:0:0:0:0:
+192,192,24625,128,0,25375:0:0:0:0:
+320,192,24750,128,0,25250:0:0:0:0:
+448,192,24875,128,0,25125:0:0:0:0:
+448,192,25375,128,0,26375:0:0:0:0:
+320,192,25500,128,0,26250:0:0:0:0:
+192,192,25625,128,0,26125:0:0:0:0:
+64,192,25750,128,0,26000:0:0:0:0:
+
+// quads
+64,192,26500,1,0,0:0:0:0:
+64,192,27500,1,0,0:0:0:0:
+192,192,27500,1,0,0:0:0:0:
+320,192,27500,1,0,0:0:0:0:
+448,192,27500,1,0,0:0:0:0:
+64,192,27750,1,0,0:0:0:0:
+192,192,27750,1,0,0:0:0:0:
+320,192,27750,1,0,0:0:0:0:
+448,192,27750,1,0,0:0:0:0:
+64,192,28000,1,0,0:0:0:0:
+192,192,28000,1,0,0:0:0:0:
+320,192,28000,1,0,0:0:0:0:
+448,192,28000,1,0,0:0:0:0:
+64,192,28250,1,0,0:0:0:0:
+192,192,28250,1,0,0:0:0:0:
+320,192,28250,1,0,0:0:0:0:
+448,192,28250,1,0,0:0:0:0:
+64,192,28500,1,0,0:0:0:0:
+192,192,28500,1,0,0:0:0:0:
+320,192,28500,1,0,0:0:0:0:
+448,192,28500,1,0,0:0:0:0:
+
+// double-trills
+64,192,29500,1,0,0:0:0:0:
+192,192,29500,1,0,0:0:0:0:
+320,192,29625,1,0,0:0:0:0:
+448,192,29625,1,0,0:0:0:0:
+64,192,29750,1,0,0:0:0:0:
+192,192,29750,1,0,0:0:0:0:
+320,192,29875,1,0,0:0:0:0:
+448,192,29875,1,0,0:0:0:0:
+64,192,30000,1,0,0:0:0:0:
+192,192,30000,1,0,0:0:0:0:
+320,192,30125,1,0,0:0:0:0:
+448,192,30125,1,0,0:0:0:0:
+64,192,30250,1,0,0:0:0:0:
+192,192,30250,1,0,0:0:0:0:
+320,192,30375,1,0,0:0:0:0:
+448,192,30375,1,0,0:0:0:0:
+64,192,30500,1,0,0:0:0:0:
+192,192,30500,1,0,0:0:0:0:
diff --git a/osu.Game.Rulesets.Osu.Tests/OsuDifficultyCalculatorTest.cs b/osu.Game.Rulesets.Osu.Tests/OsuDifficultyCalculatorTest.cs
new file mode 100644
index 0000000000..e55dc1f902
--- /dev/null
+++ b/osu.Game.Rulesets.Osu.Tests/OsuDifficultyCalculatorTest.cs
@@ -0,0 +1,25 @@
+// 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 NUnit.Framework;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Difficulty;
+using osu.Game.Rulesets.Osu.Difficulty;
+using osu.Game.Tests.Beatmaps;
+
+namespace osu.Game.Rulesets.Osu.Tests
+{
+    [TestFixture]
+    public class OsuDifficultyCalculatorTest : DifficultyCalculatorTest
+    {
+        protected override string ResourceAssembly => "osu.Game.Rulesets.Osu";
+
+        [TestCase(6.931145117263422, "diffcalc-test")]
+        public void Test(double expected, string name)
+            => base.Test(expected, name);
+
+        protected override DifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new OsuDifficultyCalculator(new OsuRuleset(), beatmap);
+
+        protected override Ruleset CreateRuleset() => new OsuRuleset();
+    }
+}
diff --git a/osu.Game.Rulesets.Osu/Resources/Testing/Beatmaps/diffcalc-test.osu b/osu.Game.Rulesets.Osu/Resources/Testing/Beatmaps/diffcalc-test.osu
new file mode 100644
index 0000000000..bf345811a2
--- /dev/null
+++ b/osu.Game.Rulesets.Osu/Resources/Testing/Beatmaps/diffcalc-test.osu
@@ -0,0 +1,179 @@
+osu file format v14
+
+[General]
+StackLeniency: 0.3
+Mode: 0
+
+[Difficulty]
+CircleSize:4
+OverallDifficulty:7
+ApproachRate:8.3
+SliderMultiplier:1.6
+SliderTickRate:1
+
+[TimingPoints]
+500,500,4,2,1,50,1,0
+62500,-500,4,2,1,50,0,0
+71000,-100,4,2,1,50,0,0
+
+[HitObjects]
+// Circles spaced 1 beat apart, with increasing jump distance
+126,112,500,5,0,0:0:0:0:
+130,155,1000,1,0,0:0:0:0:
+131,269,1500,1,0,0:0:0:0:
+341,269,2000,1,0,0:0:0:0:
+113,95,2500,1,0,0:0:0:0:
+
+// Circles spaced 1/2 beat apart, with increasing jump distance
+108,104,3500,5,0,0:0:0:0:
+110,145,3750,1,0,0:0:0:0:
+115,262,4000,1,0,0:0:0:0:
+285,265,4250,1,0,0:0:0:0:
+458,48,4500,1,0,0:0:0:0:
+35,199,4750,1,0,0:0:0:0:
+251,340,5000,1,0,0:0:0:0:
+20,352,5250,1,0,0:0:0:0:
+426,62,5500,1,0,0:0:0:0:
+
+// Circles spaced 1/4 beat apart, with increasing jump distances
+211,138,6500,5,0,0:0:0:0:
+99,256,6625,1,0,0:0:0:0:
+68,129,6750,1,0,0:0:0:0:
+371,340,6875,1,0,0:0:0:0:
+241,219,7000,1,0,0:0:0:0:
+252,148,7125,1,0,0:0:0:0:
+434,97,7250,1,0,0:0:0:0:
+40,38,7375,1,0,0:0:0:0:
+114,334,7500,1,0,0:0:0:0:
+301,19,7625,1,0,0:0:0:0:
+441,241,7750,1,0,0:0:0:0:
+121,91,7875,1,0,0:0:0:0:
+270,384,8000,1,0,0:0:0:0:
+488,92,8125,1,0,0:0:0:0:
+332,82,8250,1,0,0:0:0:0:
+108,240,8375,1,0,0:0:0:0:
+281,268,8500,1,0,0:0:0:0:
+
+// Constant spaced circles spaced 1/2 beat apart, small jump distances, changing angles
+252,191,9500,5,0,0:0:0:0:
+356,191,9750,1,0,0:0:0:0:
+311,268,10000,1,0,0:0:0:0:
+190,270,10250,1,0,0:0:0:0:
+107,199,10500,1,0,0:0:0:0:
+172,105,10750,1,0,0:0:0:0:
+297,102,11000,1,0,0:0:0:0:
+373,178,11250,1,0,0:0:0:0:
+252,195,11500,1,0,0:0:0:0:
+
+// Constant spaced circles spaced 1/2 beat apart, large jump distances, changing angles
+140,187,12500,5,0,0:0:0:0:
+451,331,12750,1,0,0:0:0:0:
+46,338,13000,1,0,0:0:0:0:
+204,50,13250,1,0,0:0:0:0:
+464,162,13500,1,0,0:0:0:0:
+252,346,13750,1,0,0:0:0:0:
+13,175,14000,1,0,0:0:0:0:
+488,181,14250,1,0,0:0:0:0:
+251,187,14500,1,0,0:0:0:0:
+
+// Constant spaced circles spaced 1/4 beat apart, small jump distances, changing angles
+188,192,15500,5,0,0:0:0:0:
+298,194,15625,1,0,0:0:0:0:
+317,84,15750,1,0,0:0:0:0:
+185,85,15875,1,0,0:0:0:0:
+77,200,16000,1,0,0:0:0:0:
+184,303,16125,1,0,0:0:0:0:
+295,225,16250,1,0,0:0:0:0:
+300,84,16375,1,0,0:0:0:0:
+144,82,16500,1,0,0:0:0:0:
+141,215,16625,1,0,0:0:0:0:
+314,184,16750,1,0,0:0:0:0:
+188,192,16875,1,0,0:0:0:0:
+188,192,17000,1,0,0:0:0:0:
+
+// Constant spaced circles spaced 1/4 beat apart, large jump distances, changing angles
+97,192,18000,5,0,0:0:0:0:
+336,38,18125,1,0,0:0:0:0:
+440,322,18250,1,0,0:0:0:0:
+39,331,18375,1,0,0:0:0:0:
+98,39,18500,1,0,0:0:0:0:
+460,179,18625,1,0,0:0:0:0:
+245,338,18750,1,0,0:0:0:0:
+12,184,18875,1,0,0:0:0:0:
+250,41,19000,1,0,0:0:0:0:
+265,193,19125,1,0,0:0:0:0:
+486,22,19250,1,0,0:0:0:0:
+411,205,19375,1,0,0:0:0:0:
+107,198,19500,1,0,0:0:0:0:
+
+// Short sliders spaced 1 beat apart
+28,108,20500,2,0,L|196:107,1,160
+25,177,21500,2,0,L|193:176,1,160
+26,308,22500,2,0,L|194:307,1,160
+320,89,23500,2,0,L|488:88,1,160
+
+// Short sliders spaced 1/2 beat apart
+28,108,25000,6,0,L|196:107,1,160
+27,173,25750,2,0,L|195:172,1,160
+25,292,26500,2,0,L|193:291,1,160
+340,213,27250,2,0,L|508:212,1,160
+21,44,28000,2,0,L|189:43,1,160
+
+// Short sliders spaced 1/4 beat apart
+28,108,29500,6,0,L|196:107,1,160
+30,169,30125,2,0,L|198:168,1,160
+35,282,30750,2,0,L|203:281,1,160
+327,286,31375,2,0,L|495:285,1,160
+51,61,32000,2,0,L|219:60,1,160
+
+// Large, medium-paced slider shapes
+// PerfectCurve
+66,86,33500,6,0,P|246:348|427:44,1,800
+66,86,36500,2,0,P|246:348|427:44,1,800
+66,86,39500,2,0,P|246:348|427:44,1,800
+// Linear
+66,72,42500,2,0,B|419:65|419:65|66:316|66:316|426:318,1,1120
+66,72,46500,2,0,B|419:65|419:65|66:316|66:316|426:318,1,1120
+66,72,50500,2,0,B|419:65|419:65|66:316|66:316|426:318,1,1120
+// Bezier
+76,287,54500,2,0,B|440:325|138:128|470:302|500:30|130:85|66:82,1,640
+76,287,57000,2,0,B|440:325|138:128|470:302|500:30|130:85|66:82,1,640
+76,287,59500,2,0,B|440:325|138:128|470:302|500:30|130:85|66:82,1,640
+
+// Large slow slider with many ticks
+81,170,62500,6,0,P|263:78|168:268,1,480
+
+// Fast slider with many repeats
+102,152,71000,6,0,L|175:153,18,64
+
+// Slider-circle combos, spaced 1/2 beat apart
+106,204,75500,6,0,P|275:33|171:304,1,800
+255,179,78250,1,0,0:0:0:0:
+106,204,78500,2,0,P|275:33|171:304,1,800
+255,179,81250,1,0,0:0:0:0:
+106,204,81500,2,0,P|275:33|171:304,1,800
+
+// Circle-spinner combos, spaced 1/2 beat apart
+82,69,85000,5,0,0:0:0:0:
+256,192,85250,8,0,86000,0:0:0:0:
+384,189,86250,5,0,0:0:0:0:
+256,192,86500,12,0,87000,0:0:0:0:
+
+// Spinner-spinner combos, spaced 1/2 beat apart
+256,192,88000,12,0,89000,0:0:0:0:
+256,192,89250,12,0,90250,0:0:0:0:
+256,192,90500,12,0,91500,0:0:0:0:
+256,192,91750,12,0,92750,0:0:0:0:
+256,192,93000,12,0,94000,0:0:0:0:
+
+// Slider-spinner combos, spaced 1/2 beat apart
+49,89,95000,6,0,L|214:87,1,160
+256,192,95625,12,0,96500,0:0:0:0:
+12,299,96625,6,0,L|177:297,1,160
+256,192,97250,12,0,98125,0:0:0:0:
+295,107,98250,6,0,L|460:105,1,160
+256,192,98875,12,0,99750,0:0:0:0:
+279,325,99875,6,0,L|444:323,1,160
+256,192,100500,12,0,101375,0:0:0:0:
+197,197,101500,6,0,L|362:195,1,160
+256,192,102125,12,0,103000,0:0:0:0:
diff --git a/osu.Game.Rulesets.Taiko.Tests/TaikoDifficultyCalculatorTest.cs b/osu.Game.Rulesets.Taiko.Tests/TaikoDifficultyCalculatorTest.cs
new file mode 100644
index 0000000000..299f84fb1f
--- /dev/null
+++ b/osu.Game.Rulesets.Taiko.Tests/TaikoDifficultyCalculatorTest.cs
@@ -0,0 +1,25 @@
+// 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 NUnit.Framework;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Difficulty;
+using osu.Game.Rulesets.Taiko.Difficulty;
+using osu.Game.Tests.Beatmaps;
+
+namespace osu.Game.Rulesets.Taiko.Tests
+{
+    public class TaikoDifficultyCalculatorTest : DifficultyCalculatorTest
+    {
+        protected override string ResourceAssembly => "osu.Game.Rulesets.Taiko";
+
+        [TestCase(2.9811336589467095, "diffcalc-test")]
+        [TestCase(2.9811336589467095, "diffcalc-test-strong")]
+        public void Test(double expected, string name)
+            => base.Test(expected, name);
+
+        protected override DifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new TaikoDifficultyCalculator(new TaikoRuleset(), beatmap);
+
+        protected override Ruleset CreateRuleset() => new TaikoRuleset();
+    }
+}
diff --git a/osu.Game.Rulesets.Taiko/Resources/Testing/Beatmaps/diffcalc-test-strong.osu b/osu.Game.Rulesets.Taiko/Resources/Testing/Beatmaps/diffcalc-test-strong.osu
new file mode 100644
index 0000000000..33510eceb7
--- /dev/null
+++ b/osu.Game.Rulesets.Taiko/Resources/Testing/Beatmaps/diffcalc-test-strong.osu
@@ -0,0 +1,257 @@
+osu file format v14
+
+[General]
+Mode: 1
+
+[Difficulty]
+CircleSize:4
+OverallDifficulty:7
+ApproachRate:8.3
+SliderMultiplier:1.6
+SliderTickRate:1
+
+[TimingPoints]
+500,500,4,2,1,50,1,0
+62500,-500,4,2,1,50,0,0
+71000,-100,4,2,1,50,0,0
+
+[HitObjects]
+// Same as diffcalc-test with finishers on every note
+142,122,0,5,4,0:0:0:0:
+142,122,125,1,4,0:0:0:0:
+142,122,250,1,4,0:0:0:0:
+142,122,375,1,4,0:0:0:0:
+142,122,500,1,4,0:0:0:0:
+142,122,625,1,4,0:0:0:0:
+142,122,750,1,4,0:0:0:0:
+142,122,875,1,4,0:0:0:0:
+142,122,1000,1,4,0:0:0:0:
+142,122,1125,1,4,0:0:0:0:
+142,122,1250,1,4,0:0:0:0:
+142,122,1375,1,4,0:0:0:0:
+142,122,1500,1,4,0:0:0:0:
+119,106,2500,1,6,0:0:0:0:
+119,106,2625,1,6,0:0:0:0:
+119,106,2750,1,6,0:0:0:0:
+119,106,2875,1,6,0:0:0:0:
+119,106,3000,1,6,0:0:0:0:
+119,106,3125,1,6,0:0:0:0:
+119,106,3250,1,6,0:0:0:0:
+119,106,3375,1,6,0:0:0:0:
+119,106,3500,1,6,0:0:0:0:
+119,106,3625,1,6,0:0:0:0:
+119,106,3750,1,6,0:0:0:0:
+119,106,3875,1,6,0:0:0:0:
+119,106,4000,1,6,0:0:0:0:
+136,90,5000,1,4,0:0:0:0:
+136,90,5125,1,6,0:0:0:0:
+136,90,5250,1,4,0:0:0:0:
+136,90,5375,1,6,0:0:0:0:
+136,90,5500,1,4,0:0:0:0:
+136,90,5625,1,6,0:0:0:0:
+136,90,5750,1,4,0:0:0:0:
+136,90,5875,1,6,0:0:0:0:
+136,90,6000,1,4,0:0:0:0:
+136,90,6125,1,6,0:0:0:0:
+136,90,6250,1,4,0:0:0:0:
+136,90,6375,1,6,0:0:0:0:
+136,90,6500,1,4,0:0:0:0:
+86,113,7500,1,4,0:0:0:0:
+86,113,7625,1,4,0:0:0:0:
+86,113,7750,1,6,0:0:0:0:
+86,113,7875,1,6,0:0:0:0:
+86,113,8000,1,4,0:0:0:0:
+86,113,8125,1,4,0:0:0:0:
+86,113,8250,1,6,0:0:0:0:
+86,113,8375,1,6,0:0:0:0:
+86,113,8500,1,4,0:0:0:0:
+86,113,8625,1,4,0:0:0:0:
+86,113,8750,1,6,0:0:0:0:
+86,113,8875,1,6,0:0:0:0:
+86,113,9000,1,4,0:0:0:0:
+146,90,10000,1,4,0:0:0:0:
+146,90,10125,1,4,0:0:0:0:
+146,90,10250,1,4,0:0:0:0:
+146,90,10375,1,6,0:0:0:0:
+146,90,10500,1,6,0:0:0:0:
+146,90,10625,1,6,0:0:0:0:
+146,90,10750,1,4,0:0:0:0:
+146,90,10875,1,4,0:0:0:0:
+146,90,11000,1,4,0:0:0:0:
+146,90,11125,1,6,0:0:0:0:
+146,90,11250,1,6,0:0:0:0:
+146,90,11375,1,6,0:0:0:0:
+146,90,11500,1,4,0:0:0:0:
+146,90,11625,1,4,0:0:0:0:
+146,90,11750,1,4,0:0:0:0:
+146,90,11875,1,6,0:0:0:0:
+146,90,12000,1,6,0:0:0:0:
+146,90,12125,1,6,0:0:0:0:
+146,90,12250,1,4,0:0:0:0:
+146,90,12375,1,4,0:0:0:0:
+146,90,12500,1,4,0:0:0:0:
+69,99,13500,1,4,0:0:0:0:
+69,99,13625,1,4,0:0:0:0:
+69,99,13750,1,4,0:0:0:0:
+69,99,13875,1,6,0:0:0:0:
+69,99,14000,1,4,0:0:0:0:
+69,99,14125,1,4,0:0:0:0:
+69,99,14250,1,4,0:0:0:0:
+69,99,14375,1,6,0:0:0:0:
+69,99,14500,1,4,0:0:0:0:
+69,99,14625,1,4,0:0:0:0:
+69,99,14750,1,4,0:0:0:0:
+69,99,14875,1,6,0:0:0:0:
+69,99,15000,1,4,0:0:0:0:
+69,99,15125,1,4,0:0:0:0:
+69,99,15250,1,4,0:0:0:0:
+69,99,15375,1,6,0:0:0:0:
+69,99,15500,1,4,0:0:0:0:
+83,89,16500,1,4,0:0:0:0:
+83,89,16625,1,6,0:0:0:0:
+83,89,16750,1,6,0:0:0:0:
+83,89,16875,1,4,0:0:0:0:
+83,89,17000,1,4,0:0:0:0:
+83,89,17125,1,4,0:0:0:0:
+83,89,17250,1,6,0:0:0:0:
+83,89,17375,1,6,0:0:0:0:
+83,89,17500,1,6,0:0:0:0:
+83,89,17625,1,6,0:0:0:0:
+83,89,17750,1,4,0:0:0:0:
+83,89,17875,1,4,0:0:0:0:
+83,89,18000,1,4,0:0:0:0:
+83,89,18125,1,4,0:0:0:0:
+83,89,18250,1,4,0:0:0:0:
+83,89,18375,1,6,0:0:0:0:
+83,89,18500,1,6,0:0:0:0:
+83,89,18625,1,6,0:0:0:0:
+83,89,18750,1,6,0:0:0:0:
+83,89,18875,1,4,0:0:0:0:
+83,89,19000,1,4,0:0:0:0:
+83,89,19125,1,4,0:0:0:0:
+83,89,19250,1,4,0:0:0:0:
+83,89,19375,1,6,0:0:0:0:
+83,89,19500,1,6,0:0:0:0:
+83,89,19625,1,4,0:0:0:0:
+84,122,20500,1,4,0:0:0:0:
+84,122,20625,2,4,L|217:123,1,120
+84,122,21125,1,4,0:0:0:0:
+84,122,21250,2,4,L|217:123,1,120
+84,122,21750,1,4,0:0:0:0:
+84,122,21875,2,4,L|217:123,1,120
+84,122,22375,1,4,0:0:0:0:
+84,122,22500,2,4,L|217:123,1,120
+84,122,23000,1,4,0:0:0:0:
+84,122,23125,2,4,L|217:123,1,120
+99,106,24500,1,4,0:0:0:0:
+99,106,24625,1,4,0:0:0:0:
+99,106,24750,2,4,L|194:107,1,80
+99,106,25125,1,4,0:0:0:0:
+99,106,25250,1,4,0:0:0:0:
+99,106,25375,2,4,L|194:107,1,80
+99,106,25750,1,4,0:0:0:0:
+99,106,25875,1,4,0:0:0:0:
+99,106,26000,2,4,L|194:107,1,80
+99,106,26375,1,4,0:0:0:0:
+99,106,26500,1,4,0:0:0:0:
+99,106,26625,2,4,L|194:107,1,80
+99,106,27000,1,4,0:0:0:0:
+99,106,27125,1,4,0:0:0:0:
+99,106,27250,2,4,L|194:107,1,80
+121,103,28500,1,4,0:0:0:0:
+121,103,28625,1,4,0:0:0:0:
+121,103,28750,1,4,0:0:0:0:
+121,103,28875,2,4,L|190:103,1,40
+121,103,29125,1,4,0:0:0:0:
+121,103,29250,1,4,0:0:0:0:
+121,103,29375,1,4,0:0:0:0:
+121,103,29500,2,4,L|190:103,1,40
+121,103,29750,1,4,0:0:0:0:
+121,103,29875,1,4,0:0:0:0:
+121,103,30000,1,4,0:0:0:0:
+121,103,30125,2,4,L|190:103,1,40
+121,103,30375,1,4,0:0:0:0:
+121,103,30500,1,4,0:0:0:0:
+121,103,30625,1,4,0:0:0:0:
+121,103,30750,2,4,L|190:103,1,40
+121,103,31000,1,4,0:0:0:0:
+121,103,31125,1,4,0:0:0:0:
+121,103,31250,1,4,0:0:0:0:
+121,103,31375,2,4,L|190:103,1,40
+121,103,32500,1,4,0:0:0:0:
+121,103,32625,1,6,0:0:0:0:
+121,103,32750,1,4,0:0:0:0:
+121,103,32875,2,4,L|190:103,1,40
+121,103,33125,1,4,0:0:0:0:
+121,103,33250,1,6,0:0:0:0:
+121,103,33375,1,4,0:0:0:0:
+121,103,33500,2,4,L|190:103,1,40
+121,103,33750,1,4,0:0:0:0:
+121,103,33875,1,6,0:0:0:0:
+121,103,34000,1,4,0:0:0:0:
+121,103,34125,2,4,L|190:103,1,40
+121,103,34375,1,4,0:0:0:0:
+121,103,34500,1,6,0:0:0:0:
+121,103,34625,1,4,0:0:0:0:
+121,103,34750,2,4,L|190:103,1,40
+121,103,35000,1,4,0:0:0:0:
+121,103,35125,1,6,0:0:0:0:
+121,103,35250,1,4,0:0:0:0:
+121,103,35375,2,4,L|190:103,1,40
+121,103,36500,1,4,0:0:0:0:
+121,103,36625,1,4,0:0:0:0:
+121,103,36750,1,6,0:0:0:0:
+121,103,36875,2,4,L|190:103,1,40
+121,103,37125,1,4,0:0:0:0:
+121,103,37250,1,4,0:0:0:0:
+121,103,37375,1,6,0:0:0:0:
+121,103,37500,2,4,L|190:103,1,40
+121,103,37750,1,4,0:0:0:0:
+121,103,37875,1,4,0:0:0:0:
+121,103,38000,1,6,0:0:0:0:
+121,103,38125,2,4,L|190:103,1,40
+121,103,38375,1,4,0:0:0:0:
+121,103,38500,1,4,0:0:0:0:
+121,103,38625,1,6,0:0:0:0:
+121,103,38750,2,4,L|190:103,1,40
+121,103,39000,1,4,0:0:0:0:
+121,103,39125,1,4,0:0:0:0:
+121,103,39250,1,6,0:0:0:0:
+121,103,39375,2,4,L|190:103,1,40
+107,106,40500,1,4,0:0:0:0:
+107,106,40625,1,4,0:0:0:0:
+107,106,40750,1,6,0:0:0:0:
+107,106,40875,1,6,0:0:0:0:
+46,112,41000,2,4,L|214:112,1,160
+107,106,41625,1,4,0:0:0:0:
+107,106,41750,1,4,0:0:0:0:
+107,106,41875,1,6,0:0:0:0:
+107,106,42000,1,6,0:0:0:0:
+46,112,42125,2,4,L|214:112,1,160
+107,106,42750,1,4,0:0:0:0:
+107,106,42875,1,4,0:0:0:0:
+107,106,43000,1,6,0:0:0:0:
+107,106,43125,1,6,0:0:0:0:
+46,112,43250,2,4,L|214:112,1,160
+107,106,43875,1,4,0:0:0:0:
+107,106,44000,1,4,0:0:0:0:
+107,106,44125,1,6,0:0:0:0:
+107,106,44250,1,6,0:0:0:0:
+46,112,44375,2,4,L|214:112,1,160
+107,106,45000,1,4,0:0:0:0:
+107,106,45125,1,4,0:0:0:0:
+107,106,45250,1,6,0:0:0:0:
+107,106,45375,1,6,0:0:0:0:
+46,112,45500,2,4,L|214:112,1,160
+256,192,47000,12,4,47500,0:0:0:0:
+256,192,47625,12,4,48000,0:0:0:0:
+256,192,48125,12,4,48500,0:0:0:0:
+256,192,48625,12,4,49000,0:0:0:0:
+256,192,50000,12,4,50500,0:0:0:0:
+183,143,50625,5,4,0:0:0:0:
+256,192,50750,12,4,51250,0:0:0:0:
+114,106,51375,5,4,0:0:0:0:
+256,192,51625,12,4,52125,0:0:0:0:
+154,143,52250,5,4,0:0:0:0:
+256,192,52375,12,4,52875,0:0:0:0:
+116,111,53000,5,4,0:0:0:0:
diff --git a/osu.Game.Rulesets.Taiko/Resources/Testing/Beatmaps/diffcalc-test.osu b/osu.Game.Rulesets.Taiko/Resources/Testing/Beatmaps/diffcalc-test.osu
new file mode 100644
index 0000000000..15326162ea
--- /dev/null
+++ b/osu.Game.Rulesets.Taiko/Resources/Testing/Beatmaps/diffcalc-test.osu
@@ -0,0 +1,285 @@
+osu file format v14
+
+[General]
+Mode: 1
+
+[Difficulty]
+CircleSize:4
+OverallDifficulty:7
+ApproachRate:8.3
+SliderMultiplier:1.6
+SliderTickRate:1
+
+[TimingPoints]
+500,500,4,2,1,50,1,0
+62500,-500,4,2,1,50,0,0
+71000,-100,4,2,1,50,0,0
+
+[HitObjects]
+// dd, spaced 1/4 beat apart
+142,122,0,5,0,0:0:0:0:
+142,122,125,1,0,0:0:0:0:
+142,122,250,1,0,0:0:0:0:
+142,122,375,1,0,0:0:0:0:
+142,122,500,1,0,0:0:0:0:
+142,122,625,1,0,0:0:0:0:
+142,122,750,1,0,0:0:0:0:
+142,122,875,1,0,0:0:0:0:
+142,122,1000,1,0,0:0:0:0:
+142,122,1125,1,0,0:0:0:0:
+142,122,1250,1,0,0:0:0:0:
+142,122,1375,1,0,0:0:0:0:
+142,122,1500,1,0,0:0:0:0:
+
+// kk, spaced 1/4 beat apart
+119,106,2500,1,2,0:0:0:0:
+119,106,2625,1,2,0:0:0:0:
+119,106,2750,1,2,0:0:0:0:
+119,106,2875,1,2,0:0:0:0:
+119,106,3000,1,2,0:0:0:0:
+119,106,3125,1,2,0:0:0:0:
+119,106,3250,1,2,0:0:0:0:
+119,106,3375,1,2,0:0:0:0:
+119,106,3500,1,2,0:0:0:0:
+119,106,3625,1,2,0:0:0:0:
+119,106,3750,1,2,0:0:0:0:
+119,106,3875,1,2,0:0:0:0:
+119,106,4000,1,2,0:0:0:0:
+
+// dk, spaced 1/4 beat apart
+136,90,5000,1,0,0:0:0:0:
+136,90,5125,1,2,0:0:0:0:
+136,90,5250,1,0,0:0:0:0:
+136,90,5375,1,2,0:0:0:0:
+136,90,5500,1,0,0:0:0:0:
+136,90,5625,1,2,0:0:0:0:
+136,90,5750,1,0,0:0:0:0:
+136,90,5875,1,2,0:0:0:0:
+136,90,6000,1,0,0:0:0:0:
+136,90,6125,1,2,0:0:0:0:
+136,90,6250,1,0,0:0:0:0:
+136,90,6375,1,2,0:0:0:0:
+136,90,6500,1,0,0:0:0:0:
+
+// ddkk, spaced 1/4 beat apart
+86,113,7500,1,0,0:0:0:0:
+86,113,7625,1,0,0:0:0:0:
+86,113,7750,1,2,0:0:0:0:
+86,113,7875,1,2,0:0:0:0:
+86,113,8000,1,0,0:0:0:0:
+86,113,8125,1,0,0:0:0:0:
+86,113,8250,1,2,0:0:0:0:
+86,113,8375,1,2,0:0:0:0:
+86,113,8500,1,0,0:0:0:0:
+86,113,8625,1,0,0:0:0:0:
+86,113,8750,1,2,0:0:0:0:
+86,113,8875,1,2,0:0:0:0:
+86,113,9000,1,0,0:0:0:0:
+
+// dddkkk, spaced 1/4 beat apart
+146,90,10000,1,0,0:0:0:0:
+146,90,10125,1,0,0:0:0:0:
+146,90,10250,1,0,0:0:0:0:
+146,90,10375,1,2,0:0:0:0:
+146,90,10500,1,2,0:0:0:0:
+146,90,10625,1,2,0:0:0:0:
+146,90,10750,1,0,0:0:0:0:
+146,90,10875,1,0,0:0:0:0:
+146,90,11000,1,0,0:0:0:0:
+146,90,11125,1,2,0:0:0:0:
+146,90,11250,1,2,0:0:0:0:
+146,90,11375,1,2,0:0:0:0:
+146,90,11500,1,0,0:0:0:0:
+146,90,11625,1,0,0:0:0:0:
+146,90,11750,1,0,0:0:0:0:
+146,90,11875,1,2,0:0:0:0:
+146,90,12000,1,2,0:0:0:0:
+146,90,12125,1,2,0:0:0:0:
+146,90,12250,1,0,0:0:0:0:
+146,90,12375,1,0,0:0:0:0:
+146,90,12500,1,0,0:0:0:0:
+
+// dddk, spaced 1/4 beat apart
+69,99,13500,1,0,0:0:0:0:
+69,99,13625,1,0,0:0:0:0:
+69,99,13750,1,0,0:0:0:0:
+69,99,13875,1,2,0:0:0:0:
+69,99,14000,1,0,0:0:0:0:
+69,99,14125,1,0,0:0:0:0:
+69,99,14250,1,0,0:0:0:0:
+69,99,14375,1,2,0:0:0:0:
+69,99,14500,1,0,0:0:0:0:
+69,99,14625,1,0,0:0:0:0:
+69,99,14750,1,0,0:0:0:0:
+69,99,14875,1,2,0:0:0:0:
+69,99,15000,1,0,0:0:0:0:
+69,99,15125,1,0,0:0:0:0:
+69,99,15250,1,0,0:0:0:0:
+69,99,15375,1,2,0:0:0:0:
+69,99,15500,1,0,0:0:0:0:
+
+// arbitrary pattern, spaced 1/4 beat apart
+83,89,16500,1,0,0:0:0:0:
+83,89,16625,1,2,0:0:0:0:
+83,89,16750,1,2,0:0:0:0:
+83,89,16875,1,0,0:0:0:0:
+83,89,17000,1,0,0:0:0:0:
+83,89,17125,1,0,0:0:0:0:
+83,89,17250,1,2,0:0:0:0:
+83,89,17375,1,2,0:0:0:0:
+83,89,17500,1,2,0:0:0:0:
+83,89,17625,1,2,0:0:0:0:
+83,89,17750,1,0,0:0:0:0:
+83,89,17875,1,0,0:0:0:0:
+83,89,18000,1,0,0:0:0:0:
+83,89,18125,1,0,0:0:0:0:
+83,89,18250,1,0,0:0:0:0:
+83,89,18375,1,2,0:0:0:0:
+83,89,18500,1,2,0:0:0:0:
+83,89,18625,1,2,0:0:0:0:
+83,89,18750,1,2,0:0:0:0:
+83,89,18875,1,0,0:0:0:0:
+83,89,19000,1,0,0:0:0:0:
+83,89,19125,1,0,0:0:0:0:
+83,89,19250,1,0,0:0:0:0:
+83,89,19375,1,2,0:0:0:0:
+83,89,19500,1,2,0:0:0:0:
+83,89,19625,1,0,0:0:0:0:
+
+// d-slider pattern, spaced 1/4 beat apart
+84,122,20500,1,0,0:0:0:0:
+84,122,20625,2,0,L|217:123,1,120
+84,122,21125,1,0,0:0:0:0:
+84,122,21250,2,0,L|217:123,1,120
+84,122,21750,1,0,0:0:0:0:
+84,122,21875,2,0,L|217:123,1,120
+84,122,22375,1,0,0:0:0:0:
+84,122,22500,2,0,L|217:123,1,120
+84,122,23000,1,0,0:0:0:0:
+84,122,23125,2,0,L|217:123,1,120
+
+// dd-slider pattern, spaced 1/4 beat apart
+99,106,24500,1,0,0:0:0:0:
+99,106,24625,1,0,0:0:0:0:
+99,106,24750,2,0,L|194:107,1,80
+99,106,25125,1,0,0:0:0:0:
+99,106,25250,1,0,0:0:0:0:
+99,106,25375,2,0,L|194:107,1,80
+99,106,25750,1,0,0:0:0:0:
+99,106,25875,1,0,0:0:0:0:
+99,106,26000,2,0,L|194:107,1,80
+99,106,26375,1,0,0:0:0:0:
+99,106,26500,1,0,0:0:0:0:
+99,106,26625,2,0,L|194:107,1,80
+99,106,27000,1,0,0:0:0:0:
+99,106,27125,1,0,0:0:0:0:
+99,106,27250,2,0,L|194:107,1,80
+
+// ddd-slider pattern, spaced 1/4 beat apart
+121,103,28500,1,0,0:0:0:0:
+121,103,28625,1,0,0:0:0:0:
+121,103,28750,1,0,0:0:0:0:
+121,103,28875,2,0,L|190:103,1,40
+121,103,29125,1,0,0:0:0:0:
+121,103,29250,1,0,0:0:0:0:
+121,103,29375,1,0,0:0:0:0:
+121,103,29500,2,0,L|190:103,1,40
+121,103,29750,1,0,0:0:0:0:
+121,103,29875,1,0,0:0:0:0:
+121,103,30000,1,0,0:0:0:0:
+121,103,30125,2,0,L|190:103,1,40
+121,103,30375,1,0,0:0:0:0:
+121,103,30500,1,0,0:0:0:0:
+121,103,30625,1,0,0:0:0:0:
+121,103,30750,2,0,L|190:103,1,40
+121,103,31000,1,0,0:0:0:0:
+121,103,31125,1,0,0:0:0:0:
+121,103,31250,1,0,0:0:0:0:
+121,103,31375,2,0,L|190:103,1,40
+
+// dkd-slider pattern, spaced 1/4 beat apart
+121,103,32500,1,0,0:0:0:0:
+121,103,32625,1,2,0:0:0:0:
+121,103,32750,1,0,0:0:0:0:
+121,103,32875,2,0,L|190:103,1,40
+121,103,33125,1,0,0:0:0:0:
+121,103,33250,1,2,0:0:0:0:
+121,103,33375,1,0,0:0:0:0:
+121,103,33500,2,0,L|190:103,1,40
+121,103,33750,1,0,0:0:0:0:
+121,103,33875,1,2,0:0:0:0:
+121,103,34000,1,0,0:0:0:0:
+121,103,34125,2,0,L|190:103,1,40
+121,103,34375,1,0,0:0:0:0:
+121,103,34500,1,2,0:0:0:0:
+121,103,34625,1,0,0:0:0:0:
+121,103,34750,2,0,L|190:103,1,40
+121,103,35000,1,0,0:0:0:0:
+121,103,35125,1,2,0:0:0:0:
+121,103,35250,1,0,0:0:0:0:
+121,103,35375,2,0,L|190:103,1,40
+
+//ddk-slider pattern, spaced 1/4 beat apart
+121,103,36500,1,0,0:0:0:0:
+121,103,36625,1,0,0:0:0:0:
+121,103,36750,1,2,0:0:0:0:
+121,103,36875,2,0,L|190:103,1,40
+121,103,37125,1,0,0:0:0:0:
+121,103,37250,1,0,0:0:0:0:
+121,103,37375,1,2,0:0:0:0:
+121,103,37500,2,0,L|190:103,1,40
+121,103,37750,1,0,0:0:0:0:
+121,103,37875,1,0,0:0:0:0:
+121,103,38000,1,2,0:0:0:0:
+121,103,38125,2,0,L|190:103,1,40
+121,103,38375,1,0,0:0:0:0:
+121,103,38500,1,0,0:0:0:0:
+121,103,38625,1,2,0:0:0:0:
+121,103,38750,2,0,L|190:103,1,40
+121,103,39000,1,0,0:0:0:0:
+121,103,39125,1,0,0:0:0:0:
+121,103,39250,1,2,0:0:0:0:
+121,103,39375,2,0,L|190:103,1,40
+
+//ddkk-slider pattern, spaced 1/4 beat apart
+107,106,40500,1,0,0:0:0:0:
+107,106,40625,1,0,0:0:0:0:
+107,106,40750,1,2,0:0:0:0:
+107,106,40875,1,2,0:0:0:0:
+46,112,41000,2,0,L|214:112,1,160
+107,106,41625,1,0,0:0:0:0:
+107,106,41750,1,0,0:0:0:0:
+107,106,41875,1,2,0:0:0:0:
+107,106,42000,1,2,0:0:0:0:
+46,112,42125,2,0,L|214:112,1,160
+107,106,42750,1,0,0:0:0:0:
+107,106,42875,1,0,0:0:0:0:
+107,106,43000,1,2,0:0:0:0:
+107,106,43125,1,2,0:0:0:0:
+46,112,43250,2,0,L|214:112,1,160
+107,106,43875,1,0,0:0:0:0:
+107,106,44000,1,0,0:0:0:0:
+107,106,44125,1,2,0:0:0:0:
+107,106,44250,1,2,0:0:0:0:
+46,112,44375,2,0,L|214:112,1,160
+107,106,45000,1,0,0:0:0:0:
+107,106,45125,1,0,0:0:0:0:
+107,106,45250,1,2,0:0:0:0:
+107,106,45375,1,2,0:0:0:0:
+46,112,45500,2,0,L|214:112,1,160
+
+// spinner-spinner pattern, spaced 1/4 beat apart
+256,192,47000,12,0,47500,0:0:0:0:
+256,192,47625,12,0,48000,0:0:0:0:
+256,192,48125,12,0,48500,0:0:0:0:
+256,192,48625,12,0,49000,0:0:0:0:
+
+// spinner-d pattern, spaced 1/4 beat apart
+256,192,50000,12,0,50500,0:0:0:0:
+183,143,50625,5,0,0:0:0:0:
+256,192,50750,12,0,51250,0:0:0:0:
+114,106,51375,5,0,0:0:0:0:
+256,192,51625,12,0,52125,0:0:0:0:
+154,143,52250,5,0,0:0:0:0:
+256,192,52375,12,0,52875,0:0:0:0:
+116,111,53000,5,0,0:0:0:0:
diff --git a/osu.Game/Tests/Beatmaps/DifficultyCalculatorTest.cs b/osu.Game/Tests/Beatmaps/DifficultyCalculatorTest.cs
new file mode 100644
index 0000000000..108fa8ff71
--- /dev/null
+++ b/osu.Game/Tests/Beatmaps/DifficultyCalculatorTest.cs
@@ -0,0 +1,51 @@
+// 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.IO;
+using System.Reflection;
+using NUnit.Framework;
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.Formats;
+using osu.Game.Rulesets;
+using osu.Game.Rulesets.Difficulty;
+using osu.Game.Rulesets.Mods;
+
+namespace osu.Game.Tests.Beatmaps
+{
+    [TestFixture]
+    public abstract class DifficultyCalculatorTest
+    {
+        private const string resource_namespace = "Testing.Beatmaps";
+
+        protected abstract string ResourceAssembly { get; }
+
+        protected void Test(double expected, string name, params Mod[] mods)
+            => Assert.AreEqual(expected, CreateDifficultyCalculator(getBeatmap(name)).Calculate(mods).StarRating);
+
+        private WorkingBeatmap getBeatmap(string name)
+        {
+            using (var resStream = openResource($"{resource_namespace}.{name}.osu"))
+            using (var stream = new StreamReader(resStream))
+            {
+                var decoder = Decoder.GetDecoder<Beatmap>(stream);
+                ((LegacyBeatmapDecoder)decoder).ApplyOffsets = false;
+
+                var working = new TestWorkingBeatmap(decoder.Decode(stream));
+                working.BeatmapInfo.Ruleset = CreateRuleset().RulesetInfo;
+
+                return working;
+            }
+        }
+
+        private Stream openResource(string name)
+        {
+            var localPath = Path.GetDirectoryName(Uri.UnescapeDataString(new UriBuilder(Assembly.GetExecutingAssembly().CodeBase).Path));
+            return Assembly.LoadFrom(Path.Combine(localPath, $"{ResourceAssembly}.dll")).GetManifestResourceStream($@"{ResourceAssembly}.Resources.{name}");
+        }
+
+        protected abstract DifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap);
+
+        protected abstract Ruleset CreateRuleset();
+    }
+}