Commander Keen 4 Cheats
PC | Submitted by GamesRadarCheats
To enable cheat mode you must hold A + 2 and then press enter. it should say "debug keys active" or something like that.
When Cheat Mode(debug mode) is active press the following:
CODE : Effect
Hold F10+G : Activates God Mode
Hold F10+J : Activates Jump Cheat
Hold F10+W : Level Warp
Hold F10+Y : Reveals Hidden Areas
Hold F10+N : Activates No Clipping Mode
Hold F10+S : Shows Sprite Mode
Hold F10+M : Shows Memory Usage
Hold F10+I : Free Items
Hold F10+D : Records A Demo
Hold F10+E : Ends the level you are in*
* NOTE: If the level you are in is a level where you have to save someone and you use this code, The level will end, and the person will not be saved.
I know how to end the whole game instantly. Just hold E+N+D and then you will see Commander Keen talking to the last person, then you get to see the ending.