Full oxygen:
Pause your game and press C(2), B, A, Down(2).

Full ammunition:
Pause your game and press B(3), Right, Down, Left.

Level skip:
Pause your game and press Up, A, Up, A(2), Down.

Red key:
Pause your game and press Down(2), B, C, Up(2).

Yellow key:
Up(2), B, C, Down, (2).

Cannon:
Pause your game and press Left, B, C, Down(2), Right.

Grenade:
Pause your game and press Up, Down, Up, Right, B, C.

Lock on:
Pause your game and press A(2), Left, Right, Left, Right.

Piercer:
Pause your game and press Up, Right, Down, Left, Up, Right.

Rapid:
Pause your game and press C, Up(2), Right(2), A.

Ricochet:
Pause your game and press Left, Right, C, A, B, Right.

Spray:
Pause your game and press Up, B, Up, A, B(2).

Tribolt:
Pause your game and press A(3), Right, A, Right.