Commander Keen 4 Cheats

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General Cheat: Pressing the B A T keys all at once will give you 99 shots, an extra life, and all the gems.

Debug Mode: Pressing A 2 Enter all at once will activate Debug Mode. The following cheats then become available:

F10 C Show number of active/inactive objects in the level
F10 D Record a demo
F10 E End the current level
F10 G God mode
F10 I Get some free items
F10 J Jump cheat
F10 M Display memory usage
F10 N No clipping (walk through walls mode; its easy to die if you go somewhere you're not supposed to)
F10 S Slow motion
F10 T Sprite test
F10 W Warp to any level
F10 Y Reveal hidden areas
F10 Y View hidden areas in the level.

Commander Keen 4 Game Review courtesy of

The Keen sequel is even better than the original! (Numbered '4' because episodes 2-3 were released only when the original was registered.) Great graphics (and now SB sound effects!) plus improved control and cool new enemies and places to explore! This must've been before the days of the 'lame sequels', eh? (Note: The game's graphics don't work correctly when using certain video cards (my old video card combo, when I had a 3dfx add-on card, is one) ... if this is the case for you, I unfortunately do not know of any fix for this.)
Download Commander Keen 4