diff --git a/src/Arch/Core/Entity.cs b/src/Arch/Core/Entity.cs
index dad7bbaa..06f8ffad 100644
--- a/src/Arch/Core/Entity.cs
+++ b/src/Arch/Core/Entity.cs
@@ -293,24 +293,7 @@ public EntityReference()
         Version = -1;
     }
 
-#if PURE_ECS
-
-    /// <summary>
-    ///     Checks if the referenced <see cref="Entity"/> is still valid and alife.
-    /// </summary>
-    /// <param name="world">The <see cref="Entity"/> <see cref="World"/>..</param>
-    /// <returns>True if its alive, otherwhise false.</returns>
-    public bool IsAlive(World world)
-    {
-        if (this == Null)
-        {
-            return false;
-        }
-
-        var reference = world.Reference(Entity);
-        return this == reference;
-    }
-#else
+#if !PURE_ECS
     /// <summary>
     ///     Checks if the referenced <see cref="Entity"/> is still valid and alife.
     /// </summary>
diff --git a/src/Arch/Core/World.cs b/src/Arch/Core/World.cs
index db81f044..c3fce492 100644
--- a/src/Arch/Core/World.cs
+++ b/src/Arch/Core/World.cs
@@ -1421,6 +1421,24 @@ public void RemoveRange(Entity entity, Span<ComponentType> types)
 
 public partial class World
 {
+    /// <summary>
+    ///     Checks if the <see cref="EntityReference"/> is alive and valid in this <see cref="World"/>.
+    /// </summary>
+    /// <param name="entityReference">The <see cref="EntityReference"/>.</param>
+    /// <returns>True if it exists and is alive, otherwise false.</returns>
+    [Pure]
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool IsAlive(EntityReference entityReference)
+    {
+        if (entityReference == EntityReference.Null)
+        {
+            return false;
+        }
+
+        var reference = Reference(entityReference.Entity);
+        return entityReference == reference;
+    }
+
     /// <summary>
     ///     Checks if the <see cref="Entity"/> is alive in this <see cref="World"/>.
     /// </summary>