100% Health
Pause the game and press A, C, C, A, B, B, A, C. If done correctly, you'll hear the word "cheater." This can only be used once per level.
1000 Bullets
Pause the game and press A, B, B, B, C, A, C, C. If done correctly, you'll hear the word "cheater."
Another Extra Guy
Pause the game and press B, B, C, C, A, A, A, A. This trick is limited to one use per level.
Extra Continue
Pause the game and press A, LEFT + B, A, B, A, B, C, A. If done correctly, you'll hear the word "cheater".
Extra Life
Pause the game and press UP + B, B, A, C, A, A, A, A. If done correctly, you'll hear the word "cheater".
Level Select
Press Left + A, B, B, A, Right + A, B, B, A.
Level Skip
To skip a level, pause the game and press A, A+C, C, and A. Then press Start.
Plasma Guns
For 9 extra guns, pause the game and press Down + C, A, B, C, A, B, A, C.
Secret Air Pump In "Down The Tubes"
In the level "Down the tubes", during the third and last ride in the water shuttle, if you go about half way, on the left side there are two lights. If you go through the wall at these two lights, you can find a secret air pump where you can get more air. This allows you more time to get through the level without running out of air.
Warp to "What The Heck"
Pause the game and press Left, Right, A, B, C, Left, Right, A.
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