Commander Keen 1: Marooned on Mars/Codes

The key combinations need to be pressed at the same time.
 * 1) [C] [T] [space] - Gives pogostick, all keycards, and full ammo.
 * 2) [shift] [tab] - Pass through an unplayed level on world map.
 * 3) [G] [O] [D] - Will put your keen in GOD Mode and will give you a jump cheat.