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.


Skip Parsnip Pass
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Start at the beginning of the Parsnip Pass level. Go up to the top, 
where there is a log and two squashes on it. Next, jump high enough 
to get the squashes attention, and wait for them to jump over to the 
rightmost side of the screen. Fall down with them. When you hit the 
bottom, where there is an island with water on the left side, stand 
next to the right side, which is a wall that you cannot see. Wait 
for the squashes to fall and hit you. When they hit you, you will 
begin to fall asleep, but you will hit the wall and the "Loading The 
Land of Tuberia" message will appear. You will not lose a life, but 
Parsnip Pass will be completed.

Fly:
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Find a spot where you want to go up, and jump. While in midair, shoot 
down as you are falling. . If done correctly, Keen will be standing 
about a one shot width off the ground. Just look up and shoot. You will 
take off straight up at the speed of your shot. Note: Some practice is 
required to get the correct timing. 

Items:
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Press B + A + T to receive an extra life, 99 rounds of ammunition, and 
all four diamond keys for a level.