Aditional characters in multi-player mode: Complete any level and save the game to unlock an additional character in multi-player mode.
Big Gun Mode: Slay all apponents in level 3 nuclear winter.
Big Head Mode: Rescue all babes in level 2 liberty or death.
Character set 1: Press a,l,r,left,b,down,up, when Press Start appears at the opening screen. (A tone confirms.)
Character Set 2: Press B,A twice,R,L when the press start appears at the oppening screen. (A tone confirms.)
Character set 3: Press l twice, up, down, R,B,A when the press start appears at the opening screen. (A ton confirms.)
Character set 4: Press b three times,R,Left,A when the press start appears at the opening screen. (A tone Confirms.)
Character set 5: Press Right,B,Left,L,A,Z when press start appears at the opening screen. (A tone confirms.)
Character set 6: Press up,down,B,A twice,Left when press start appears at the opening screen.(A tone confirms.)
Extreme Mode: Successfuly complete the game with all the babes rescued and all opponents killed.
First person perspective: press down, up,L,B,Z,left,Up-C,Right-C,Left-C,Z when press start appears at the opening screen.(A tone confirms.)
Flat shade map: obtain all the in the secret level ,"wetworld".
Freeze thrower with unlimited ammo: press down,up,A,L,R,Z when press start appears at the opening screen. (A tone confirms.)
High speed zombies: Rescue all babes in level 8 dry town
Ice Skin: rescue all babes in level 5 fallout.
Maximum SMG ammunition: Obtain all secrets in level 15 dawn of the duke
Maximum volt-c ammunition: obtain all secrets in level 17 the rack.
Maximum blaster ammunition: slay all opponents in level 9 jailbreak.
Maximum freezer ammo: slay all opponents in level 20 the brothers nukem.
max gamma ammo: slay all opponents in level 21 Alien Mothership.
max gattlin gun ammo: slay all opponents in level 16 hydrogen bomb.
max revolver ammo: rescue all babes and obtain all secrets in level 12 probing the depths.
Max rifle ammo: rescue all babes in level 11 FT. Roswell
Max Sawn-off shotgun ammo: Slay all in level 13 white chapel killings
max shotgun ammo: Rescue all babes in level 10 up ship creek.
Max sniper ammo: rescue all babes in the secret level going down.
Rifle with unlimited ammo: press c up,c down,c left,c right,L,R when press start appears at the opening screen. (A tone confirms.)
secret level going down: Obtain all of the time machine pieces before reaching the rack.A second portal should appear in a room adjacent to the first.
Secret level wet world: after powering up at the end of level 13 nuclear winter jump into the roof below.(you will see a medkit there.)From the roof jump ino the water and swim to the floating platform.
weather: obtain all the secrets in level 5 under seige.
