Codes

At any point during the game, pause the game and press the button combination to recieve the desired effect.
Code                    Effect
B, B, B, Right, Down, Left	Full Ammo
C, C, B, A, Down, Down  Full Oxygen
A, A, Left, Right, Left, Right	Lock on Mode
Left, B, C, Down, Down, Right	Obtain Cannon
Down, Down, B, C, Up, UpObtain Red Key
Up, Up, B, C, Down, DownObtain Yellow Key
Up, Right, Down, Left, Up, Right	Piercer
C, Up, Up, Right, Right, A	Rapid mode
Left, Right, C, A, B, Right	Ricochet mode
Up, A, Up, A, A, Down   Skip to the next level
Up, B, Up, A, B, B      Spray mode
A, A, A, Right, A, RightTribolt mode