diff --git a/ideas.md b/ideas.md
index 3482e01..344fbc5 100644
--- a/ideas.md
+++ b/ideas.md
@@ -7,4 +7,7 @@ Various random ideas that aren't (yet) part of the design
 - Multiple tile layers.
     - Back layer
     - Wall layer
-    - Ore/misc insert layer
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+    - Ore/misc insert layer
+
+- No world hopping.
+  Characters are worlds are linked together, like in Minecraft.
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