Hold II and turn on the system. Keep holding II until the title screen appears and press Up 4 times, Down 4 times, Up, Down, Left, Right. Now, release II and start the game. If done right, every time you earn points, you'll earn an additional 256 points.
Hold Select and turn on the system. Keep holding Select until the title screen appears and press Up, Up, Down, Down, Left, Left, Right, Right, Up, Down, Left, Right. Now, release Select and start the game. If done right, you'll have 200 seconds left instead of 99.
Play a game and get a game over. On the continue screen, select "No" to go back to the title screen. Now, at the title screen, press and hold Run to go to the main menu. While still holding Run, press Up 3 times, Right 3 times, Down 3 times, Left 3 times. If done right, a sound will be heard. Now start a new game and when you press Run during the game, you'll have the option of restarting the stage.
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