Black and White mode
Effect Code Black and White mode During the game press Select 15 times, then press Run to pause. While the game is paused hold Button I and press Up
Easy extra lives
Effect Code Every enemy you kill will leave a 1-Up Pause and unpause the game 100 times
At the Sound Screen , Press SELECT, UP,Up,DOWN,DOWN,LEFT,RIGHT,LEFT,RIGHT,II,I. You'll hear a bizarre screen that flashes the color red, and you can control the brightness and flashing rate by pressing SELECT to switch between the two.
Contributed By: shadowcore76.
Hidden bonus game.
Effect Code Hidden Bonus Game At the sound test screen press Select, Up, Up, Down, Down, Left, Right, Left, Right, Button II, Button I. When the screen flashes press Button II, Up, Up, Down, Down, Left, Right, Left, Right, Button II, Button I
Effect Code Sound Test At the screen where you are asked to input your birthday hold Up + Button I and press Run Start at the last boss At the screen where you are asked to input your birthday hold Down + Button I and press Run
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