Debug Menu:
At the title screen quickly press up, down, left, right, down, down
right, right, square. If done correctly you should hear a
chime and a debug menu will appear.
Invincibility
Start a game and press start then select. Choose abort mission. Then at the title
screen press up, up, up, down, down, down, triangle. If done correctly you should hear
a chime. Start a new game and your tank is invincible.