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Debug mode:
Enter the "Options" menu during game play and use the "Quit Game" selection.
Press Left, Right, Left, Right, Left, Right, Right, Right, A at the "Yes" or "No" prompt.
Enter the "Utilities" menu and select the "Test Mode" option.

Ending bonus:
Complete the game and wait at the final screen of the game for a few minutes.
A new screen that displays your completion time and medal will appear as a series of audio bloopers plays.
Note: The faster the game is completed, the more bloopers will be played.