Ninety-nine credits:
Press Left(3), Up(2), Right, Left, Right when demonstration mode begins.

Level select:
Press Up, Right, Left(2), Up, Down, Right, Left at the title screen. A chime will confirm correct code entry.

Expert mode:
Press Up, Down, Left(2), Right(2), Up, Down at the title screen. A chime will confirm correct code entry.

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