All Weapons
While playing, hold Select and press L1, Square, Triangle, Square, Square, Circle, Square, Circle, Triangle.

Full Ammo
While playing, hold Select and press L1, X, Square, Triangle, Triangle, X, Circle, Triangle, X.

Full Health
While playing, hold Select and press L1, Triangle, X, X, Circle, X, Triangle, Square, Square.

Invulnerability
While playing, hold Select and press L1, Circle, Circle, Square, Circle, Triangle, X, X, Circle.

Passwords

Level - Passwords:

Chemical Factory - S,O,X,O,T,T,X,X,O,S,X,S
Rooftops - X,T,S,O,S,X,T,O,T,T,T,T
Jupiter Station - T,X,T,S,O,O,X,O,X,T,S,S
Triton - X,O,T,O,S,T,X,X,S,O,O,T
Mars - O,X,O,T,X,X,S,O,O,X,T,X
Antarctica - S,O,X,T,T,O,S,T,X,T,S,T
IO - O,S,O,X,T,T,X,O,X,T,X,X
Reactor - S,X,O,O,T,X,X,S,O,T,O,O
Orbiting Habitat - S,O,X,X,S,X,T,O,S,O,T,S
Dream - T,T,X,X,O,O,T,T,T,S,S,O
Prison - O,S,T,O,X,O,S,T,X,X,O,S
Fortress - T,T,X,S,T,T,O,X,O,S,X,O