Level select:
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Start a game, the Hero and Mission screen appears. Now hold down A, B, C and press
Left, Right, Up, Down on D-Pad. You are now able to select the level by pressing Left/Right.
Sound Test:
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To enable the sound test, first beat the game. Then during the ending sequence,
press and hold buttons A, B, C, Down, and Left. Keep holding these and press
Start until the sound test screen appears.
