diff --git a/solutions/04_multiplicity.md b/solutions/04_multiplicity.md
index 32d5ba52..965c6c17 100644
--- a/solutions/04_multiplicity.md
+++ b/solutions/04_multiplicity.md
@@ -3,3 +3,9 @@
 ```javascript
     map.placeObject(map.getWidth()-5, map.getHeight()-5, 'exit');
 ```
+
+## IPv2: Remove walls
+
+```javascript
+    if (false)
+```