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PC - Windows Cheats: Commander Keen: 1 Cheats

Cheat :
Items:
Hold T + A + B for 99 rounds of ammunition and an extra life.

More items:
Hold C + T + [Space] to receive the pogo stick, all key cards, and ray gun charges. Alternatively, press [Ctrl] + [Tab] + [Space].

Invincibility:
Hold G + O + D. This also allows better jumps.

Level skip:
Press [Shift] + [Tab] while at the map level.