diff --git a/OpenRA.FileFormats/WRange.cs b/OpenRA.FileFormats/WRange.cs
index 216f8bd77e..003e2d308a 100644
--- a/OpenRA.FileFormats/WRange.cs
+++ b/OpenRA.FileFormats/WRange.cs
@@ -27,6 +27,9 @@ namespace OpenRA
 		public static WRange operator +(WRange a, WRange b) { return new WRange(a.Range + b.Range); }
 		public static WRange operator -(WRange a, WRange b) { return new WRange(a.Range - b.Range); }
 		public static WRange operator -(WRange a) { return new WRange(-a.Range); }
+		public static WRange operator /(WRange a, int b) { return new WRange(a.Range / b); }
+		public static WRange operator *(WRange a, int b) { return new WRange(a.Range * b); }
+		public static WRange operator *(int a, WRange b) { return new WRange(a * b.Range); }
 
 		public static bool operator ==(WRange me, WRange other) { return (me.Range == other.Range); }
 		public static bool operator !=(WRange me, WRange other) { return !(me == other); }
diff --git a/OpenRA.Game/CPos.cs b/OpenRA.Game/CPos.cs
index 82b17d3d8b..b1743ea037 100644
--- a/OpenRA.Game/CPos.cs
+++ b/OpenRA.Game/CPos.cs
@@ -41,7 +41,9 @@ namespace OpenRA
 		public int2 ToInt2() { return new int2(X, Y); }
 		public PPos ToPPos() { return new PPos(Game.CellSize * X, Game.CellSize * Y); }
 
-		public WPos CenterPosition { get { return new WPos(1024*X + 512, 1024*Y + 512, 0); } }
+		public WPos CenterPosition { get { return new WPos(1024 * X + 512, 1024 * Y + 512, 0); } }
+		public WPos TopLeft { get { return new WPos(1024 * X, 1024 * Y, 0); } }
+		public WPos BottomRight { get { return new WPos(1024 * X + 1023, 1024 * Y + 1023, 0); } }
 
 		public CPos Clamp(Rectangle r)
 		{
diff --git a/OpenRA.Game/WorldUtils.cs b/OpenRA.Game/WorldUtils.cs
index 64c47d5af5..0472512ec4 100755
--- a/OpenRA.Game/WorldUtils.cs
+++ b/OpenRA.Game/WorldUtils.cs
@@ -27,6 +27,16 @@ namespace OpenRA
 			return FindUnits(world, loc, loc).Where(a => !world.FogObscures(a));
 		}
 
+		public static IEnumerable<Actor> FindUnits(this World world, CPos tl, CPos br)
+		{
+			return world.FindUnits(tl.TopLeft, br.BottomRight);
+		}
+
+		public static IEnumerable<Actor> FindUnits(this World world, WPos tl, WPos br)
+		{
+			return world.FindUnits(PPos.FromWPos(tl), PPos.FromWPos(br));
+		}
+
 		public static IEnumerable<Actor> FindUnits(this World world, PPos a, PPos b)
 		{
 			var u = PPos.Min(a, b);
@@ -34,6 +44,17 @@ namespace OpenRA
 			return world.WorldActor.Trait<SpatialBins>().ActorsInBox(u,v);
 		}
 
+		public static Actor ClosestTo(this IEnumerable<Actor> actors, Actor a)
+		{
+			var pos = a.CenterPosition;
+			return actors.OrderBy(b => (b.CenterPosition - pos).LengthSquared).FirstOrDefault();
+		}
+
+		public static Actor ClosestTo(this IEnumerable<Actor> actors, WPos pos)
+		{
+			return actors.OrderBy(a => (a.CenterPosition - pos).LengthSquared).FirstOrDefault();
+		}
+
 		public static Actor ClosestTo(this IEnumerable<Actor> actors, PPos px)
 		{
 			return actors.OrderBy( a => (a.CenterLocation - px).LengthSquared ).FirstOrDefault();