Can walk out of bounds in the volcano secret base.

[Mavin Powder]

When standing right in front of the exit of the volcano secret base it's possible to just walk through the exit without exiting the base.

(img 1 shows the character immediately after entering the base, but this also works after walking around the base for a bit. You just have to stop in front of the exit before walking through.)

edit: this also works in cyan caverns and mini volcano, but not in any of the other layouts.