While playing, hold Run to pause the game and then also hold Select to reset the game. Keep the buttons held, then when the title screen is displayed, release Run and press Up. Release Select and press Up three times, Right six times, Down, Down, Left, Left. The Invincibility and level select screen will appear.
Effect Code Second Loop At the title screen, hold Up + Select + I + II and press Run to start on the second playthrough of the game.
Contributed By: PIW.
Hold I + II + Right and press Run, Run when the phrase ''The End'' appears after game play is over. Alternatively, hold I + II + Down and press Run at the title screen after game play is over. The game will continue up to three times from the start of the last level played.
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