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Alien Trilogy

Flaming Shotgun

Pause game, then enter: T,O,O,S.

Level Jump

At the password screen, enter: GOLVL, then a level number (like, GOLVL20).
Levels go to 34, 35 is then ending.

Cheat, EVERYTHING!

(all weapons, levels, invincibility and unlimited ammo) At the password screen, enter:
1gotp1nk8c1dbootson
Note: 1 = the #1, not an I

Cheat

TYPE IN 1GOTPINK8CIDBOOTSON FOR THE UTIMATE CHEAT.