Laser Gun
Complete the game twice and save the game. Then, start a new game from the saved game file to receive a heat-seeking laser gun.

Special Gun and Infinite Ammo
If you complete the game twice you get a special gun. If you play the game out three times, you will receive infinite ammo. If you beat the game four times you will receive all of the special guns.

Rocket Launcher
At title screen press X, Y, A, R, Start.
Submitted by Antwone_Brown. 

Unlimited Rounds
At a save point hold L and hit X, X, Up, Down, B, Y, Right, A, Start.
Submitted by Antwone_Brown. 

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