Passwords

Speak Japanese:
enter "godzilla" in password and your players will speak japanese

More Missions
enter "PATSUX" in the password for more missions

During gameplay, enter these codes for:
instant ion cannon ( r,d,l,l,d,r,r,d,l,x,sq,tr )
instant airstrike ( r,d,l,l,d,r,r,d,l,x,sq,O )

Instant nuclear missle pause and hit right, down, left, left, down, right, right, down, left, x, up , x