All Weapons
Pause the game, then press: Up, Right, Left, Down, B, L, R, A, Right, X, B, Left, R, Y, Up to get all weapons.
Submitted by Joshua. 

Invincibility
Pause the game, then press: Down, Left, Up, Right, L, A, X, Left, R, B, Y, Up, L, A, Down to become invincible.
Submitted by Joshua. 

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