Invalid You can get stuck inside level walls if you run into a ring that's adjacent to it

[Sun]

If you are moving at a certain speed(dunno if speed actually matters; I moved fast in all cases I think), and you jump, and land just inbetween the wall and the floor, you can partially go inside the wall(shorter wall near the floating platform).

 

[Spazzo]

This isn't a map-related bug, it's an issue with item (namely ring) collision at high speeds. Try running at a wall that has a ring placed right near it.

 

[Sun]

Um, I was able to get into the wall without collecting any rings. I forgot to mention, I haven't been able to do this with the other three walls.

 

[Liliam]

It's probably just the west/southmost wall permeability bug.