The stage select screen: U,D,D,D,D,U, then A+Start.
The Debug Code: Activate level select, let the demo clip play, then when at the title screen again press C,C,C,C,U,D,D,D,D,U, then A+Start, hold A on a level to activate debug mode.
2 Player mode: Highlight a zone in the stage select and press: B + Start for playing 2-player splitscreen mode.
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