=>Continue: After being defeated, and before the GAME OVER message appears,
press A B B A. This only works in the first three levels.
=>Stage Select: On the title screen, as soon as the characters stop shooting,
press U D A A B L R A B U A D R R L B U L A R B L R A L U A D A R L A START
before the demo appears. If you do it correctly and quickly, STAGE 1 will
appear next to the airplane screen. Press A or B to select the level you
want. You'll have to be VERY FAST to have this code work.
=>Double Tank: Place both characters on the tank and have each press A at the
same time - both will receive a tank. To do the same thing with helicopters,
have both players press A+B when on the helicopter.
=>Invisible: In a 2 player game, have the red guy grab the SS power and start
running. The blue guy will fall behind and turn invisible.