Nine Lives
Press Y, A, Right, Down, Down, A, Left, Right.

100% Energy
Press Left, A, Z, Y, Down, A, Y, Down.

Plasma Gun
Press C, A, Right, Right, Up, Down, Up, Left.

Three-finger Gun
Press Down, A, Up, B, Right, Right, C, Right.

More Homing Missles
Pause the game. Press Y, A, Up, X, C, Left, Y, Up.

More nuke-gun Ammo
Pause the game. Press Y, A, X, Up, Right, Right, Left, Up.

More Machine Gun Ammo
Pause the game. Press A, Up, Down, Right, Right, Left, X, C.

Level Passcodes
Level 2:(normal) gun – energy – blue gun – sandwich – can worms
Level 3: bubblegun – sandwich – sandwich – buble gun – energy
Level 4: 3 gun – gun – missle gun – 3 gun – blue gun
Level 5: energy – bubble gun – bullet – can worms – Jim
Level 6: bullet – sandwich – gun – Jim – gun
Level 7: missle gun – blue gun – bubble gun – bullet – sandwich
Level 8: blue gun – can worms – bullet – missle gun – Jim
Level 9: bullet – gun – missle gun – bullet – Jim
Leve 10: sandwich – gun – Jim – blue gun – blue gun
Level 11: 3 gun – bullet – bubble gun – energy – bubble gun
Level 12: missle gun – energy – bullet – energy – energy