diff --git a/osu.Game.Rulesets.Mania/Objects/ManiaHitObject.cs b/osu.Game.Rulesets.Mania/Objects/ManiaHitObject.cs
index 27bf50493d..6289744df1 100644
--- a/osu.Game.Rulesets.Mania/Objects/ManiaHitObject.cs
+++ b/osu.Game.Rulesets.Mania/Objects/ManiaHitObject.cs
@@ -2,7 +2,6 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using osu.Framework.Bindables;
-using osu.Game.Rulesets.Mania.Objects.Types;
 using osu.Game.Rulesets.Mania.Scoring;
 using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Objects.Types;
diff --git a/osu.Game/Rulesets/Edit/Checks/CheckConcurrentObjects.cs b/osu.Game/Rulesets/Edit/Checks/CheckConcurrentObjects.cs
new file mode 100644
index 0000000000..7c41569fab
--- /dev/null
+++ b/osu.Game/Rulesets/Edit/Checks/CheckConcurrentObjects.cs
@@ -0,0 +1,88 @@
+// 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 osu.Game.Beatmaps;
+using osu.Game.Rulesets.Edit.Checks.Components;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Types;
+
+namespace osu.Game.Rulesets.Edit.Checks
+{
+    public class CheckConcurrentObjects : ICheck
+    {
+        // We guarantee that the objects are either treated as concurrent or unsnapped when near the same beat divisor.
+        private const double ms_leniency = CheckUnsnaps.UNSNAP_MS_THRESHOLD;
+
+        public CheckMetadata Metadata { get; } = new CheckMetadata(CheckCategory.Compose, "Concurrent hitobjects");
+
+        public virtual IEnumerable<IssueTemplate> PossibleTemplates => new IssueTemplate[]
+        {
+            new IssueTemplateConcurrentSame(this),
+            new IssueTemplateConcurrentDifferent(this)
+        };
+
+        public virtual IEnumerable<Issue> Run(IBeatmap playableBeatmap, IWorkingBeatmap workingBeatmap)
+        {
+            for (int i = 0; i < playableBeatmap.HitObjects.Count - 1; ++i)
+            {
+                var hitobject = playableBeatmap.HitObjects[i];
+
+                for (int j = i + 1; j < playableBeatmap.HitObjects.Count; ++j)
+                {
+                    var nextHitobject = playableBeatmap.HitObjects[j];
+
+                    // Accounts for rulesets with hitobjects separated by columns, such as Mania.
+                    // In these cases we only care about concurrent objects within the same column.
+                    if ((hitobject as IHasColumn)?.Column != (nextHitobject as IHasColumn)?.Column)
+                        continue;
+
+                    // Two hitobjects cannot be concurrent without also being concurrent with all objects in between.
+                    // So if the next object is not concurrent, then we know no future objects will be either.
+                    if (!areConcurrent(hitobject, nextHitobject))
+                        break;
+
+                    if (hitobject.GetType() == nextHitobject.GetType())
+                        yield return new IssueTemplateConcurrentSame(this).Create(hitobject, nextHitobject);
+                    else
+                        yield return new IssueTemplateConcurrentDifferent(this).Create(hitobject, nextHitobject);
+                }
+            }
+        }
+
+        protected bool areConcurrent(HitObject hitobject, HitObject nextHitobject) => nextHitobject.StartTime <= hitobject.GetEndTime() + ms_leniency;
+
+        public abstract class IssueTemplateConcurrent : IssueTemplate
+        {
+            protected IssueTemplateConcurrent(ICheck check, string unformattedMessage)
+                : base(check, IssueType.Problem, unformattedMessage)
+            {
+            }
+
+            public Issue Create(HitObject hitobject, HitObject nextHitobject)
+            {
+                var hitobjects = new List<HitObject> { hitobject, nextHitobject };
+                return new Issue(hitobjects, this, hitobject.GetType().Name, nextHitobject.GetType().Name)
+                {
+                    Time = nextHitobject.StartTime
+                };
+            }
+        }
+
+        public class IssueTemplateConcurrentSame : IssueTemplateConcurrent
+        {
+            public IssueTemplateConcurrentSame(ICheck check)
+                : base(check, "{0}s are concurrent here.")
+            {
+            }
+        }
+
+        public class IssueTemplateConcurrentDifferent : IssueTemplateConcurrent
+        {
+            public IssueTemplateConcurrentDifferent(ICheck check)
+                : base(check, "{0} and {1} are concurrent here.")
+            {
+            }
+        }
+    }
+}
diff --git a/osu.Game/Rulesets/Edit/Checks/CheckUnsnaps.cs b/osu.Game/Rulesets/Edit/Checks/CheckUnsnaps.cs
index ff270b6d60..564ef13d8f 100644
--- a/osu.Game/Rulesets/Edit/Checks/CheckUnsnaps.cs
+++ b/osu.Game/Rulesets/Edit/Checks/CheckUnsnaps.cs
@@ -12,7 +12,7 @@ namespace osu.Game.Rulesets.Edit.Checks
 {
     public class CheckUnsnaps : ICheck
     {
-        private const double unsnap_ms_threshold = 2;
+        public const double UNSNAP_MS_THRESHOLD = 2;
 
         public CheckMetadata Metadata { get; } = new CheckMetadata(CheckCategory.Compose, "Unsnapped hitobjects");
 
@@ -54,7 +54,7 @@ namespace osu.Game.Rulesets.Edit.Checks
 
         private IEnumerable<Issue> getUnsnapIssues(HitObject hitobject, double unsnap, double time, string postfix = "")
         {
-            if (Math.Abs(unsnap) >= unsnap_ms_threshold)
+            if (Math.Abs(unsnap) >= UNSNAP_MS_THRESHOLD)
                 yield return new IssueTemplate2MsOrMore(this).Create(hitobject, unsnap, time, postfix);
             else if (Math.Abs(unsnap) >= 1)
                 yield return new IssueTemplate1MsOrMore(this).Create(hitobject, unsnap, time, postfix);
diff --git a/osu.Game.Rulesets.Mania/Objects/Types/IHasColumn.cs b/osu.Game/Rulesets/Objects/Types/IHasColumn.cs
similarity index 90%
rename from osu.Game.Rulesets.Mania/Objects/Types/IHasColumn.cs
rename to osu.Game/Rulesets/Objects/Types/IHasColumn.cs
index 1ea3138828..dc07cfbb6a 100644
--- a/osu.Game.Rulesets.Mania/Objects/Types/IHasColumn.cs
+++ b/osu.Game/Rulesets/Objects/Types/IHasColumn.cs
@@ -1,7 +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.
 
-namespace osu.Game.Rulesets.Mania.Objects.Types
+namespace osu.Game.Rulesets.Objects.Types
 {
     /// <summary>
     /// A type of hit object which lies in one of a number of predetermined columns.