Perfect Weapon

Invincibility:
Pause the game, press and hold Circle + Square + RIGHT. Release, then press Left + R1 + R2. You should hear a sound if done correctly.

Cheat Codes (pause the game and press following keys):
Play as Cyborg Blake - R1 + R2 + Triangle + Circle.
All Sphere Mode - L1 + L2 + Circle + Square.
Level Select - R1 + Square + Triangle, Circle, X.
Big Head Mode - L1 + L2 + R2 + DOWN.

Level Passwords

Start of Levels:
Ice Moon     - X, Square, X, Square(x2), Circle, Square, Circle
Garden Moon  - Circle, X(x2), Triangle, Circle(x2), X, Triangle
Forest Moon  - Circle, Triangle, Square, Circle, Square(x2), Triangle(x2)
Desert Moon  - Circle, X(x3), Triangle, Circle, Triangle(x2)
Proteus Moon - X(x2), Square, X, Square(x2), Triangle, Circle

Overseer:
Ice Moon     - Triangle(x2), X, Square, Triangle(x2), X, Circle
Garden Moon  - Circle(x2), X, Square, X(x2), Circle, Triangle
Forest Moon  - Triangle, Circle, X(x2), Triangle, Sqaure, Triangle(x2)
Desert Moon  - Circle, X, Circle(x2), Square, Circle, X, Square
Proteus Moon - Circle, X(x2), Square(x3), Triangle

 