Play as President Weller
Successfully complete the game on the ultimate difficulty setting. Then at the title screen, press L, R, L, R, Start. If you entered the code correctly, you will hear a sound.
Play as an alien
Successfully complete the game on the ultimate difficulty setting. Then at the title screen, press L, R, L, R, Z. If you entered the code correctly, you will hear a sound.
Extra mode
Successfully complete the game on the ultimate difficulty setting. Then at the title screen, press L, R, L, R, A. If you entered the code correctly, you will hear a sound, and the word "Extra" will appear at the lower right corner of the title.
HintsLearn more fighting abilities
Note: A lot of life chargers are required for this trick. You have to fight the mutants to learn different types of fighting moves. Fight one over and over again by going back into the room. Sometimes the best thing to do is to allow a mutant hurt you first. A "bing" sound will indicated that you have learned a new fighting ability. Do not forget to save the moves.
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