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Cheat mode
At the main menu, highlight the "Options" selection. Hold X + A on controller two, then hold B on controller one. Keep all buttons held until additional options that allow level selection, new difficulty levels (Mania and Very Easy), and increasing number of lives up to nine appear.
Two players as same character
At the title screen, hold Down/Right + A on controller one and Left + X on controller two. Press B on controller two while all buttons are held. Select two player mode and choose the same character. Note: Both characters will appear identical.
Reveal cheat menu code
Successfully complete the game on the hardest difficulty setting. The game will reveal the cheat code during the last picture of the ending credits.
Kill one Boss only (stage 6)
In stage 6, with the 2 bosses, defeat Souther (the Boss with claws) and Stealth (the other Boss) will die as well.
Bonus life locations
At the very start of stage 1, move to the bottom left of the screen and press A.
In the first scene of stage 1, if a player defeats Altet (the second opponent that appears from a manhole), he/she will get extra points and may earn an extra life.
In stage 2, after leaving the supply truck, go back in, move to the top, and press A.
In the alien house, stage 3, defeat Dehelits then search in the bushes at the bottom of the screen for an extra life