Garg!!! Super Bastard Mario is the right name.
Oh, and I also just realized that the title of this thread refers to Keen 6 (non intuitively).
But yeah, about the bug. I agree with KR, I thought this was well-known ...
Keen5: Shelly/Door Glitch = Bonus level!
Wow, so it does! I didn't notice, either. I'll fix the title.
My newest mod - Commander Keen: Sunset: viewtopic.php?t=8568 | codename H.Y.E.N.A.