Commander Keen - Goodbye Galaxy

Cheatmode:
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To enable cheat mode, start a game and press A 2 ENTER.
To use it, press F10 followed by one of the following keys:
G - God mode
W - Jump level
J - High jump
N - No clipping
I - Free items
T - Sprite test
D - Record a demo
V - Add a VLB
M - Get memory usage info
E - Restart game
S - Put game in slow-mo
Y - Makes the game look weird
C - Mega-stats
Power-Ups:
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To receive the pogo stick, key cards, and gun charges easily,
press C T Space while playing.
Skip City:
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To bypass any city on the map screen, press Shift Tab and
walk through it.