Super Monkey Ball Jr./Hidden content

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On the title screen, press . This halves the vertical resolution of the 3D sections in an attempt to boost frame rates.

On the title screen, press . This unlocks everything in the game.

On the title screen, input the Konami code (). Aside from the title screen, nothing else changes - it's just an Easter egg, and remarkably similar to the "real" enable all cheat mentioned above.