Commander Keen: Aliens Ate My Babysitter Cheats
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During gamplay, type in these codes:

F10+G     God mode
F10+I     99 ammo, all keys and items
F10+E     End level
F10+J     Fly mode
F10+N     No clipping
F10+W     Level warp
F10+Z     Reveal hidden areas
F10+D     Record demo, press F10+D again to save