Bonus Levels:
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By pressing buttons 1+2 at the sametime during the Title Screen.
Remove Pause Text:
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Pause the game (by pressing run) and then press I, II, and Select
all at once.
View Ending:
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Enable the Bonus level cheat. Highlight 'Exit’, then press II +
Run.
Clear pause screen:
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Pause the game and then hold I + II + Select.
Ending sequence preview:
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First activate the „practice bonus round” code and then highlight
the Exit option and press II + RUN.
Practice bonus rounds:
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Hold II and then press run on the difficulty selection menu.