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• Extra challenges

Finish retroland level.
[Report]

• Extra level

Finish the game.
[Report]

• Inventions

To tell if you can make a invention, there will be a box on the top right of the screen.
[Report]

• Jump Higher

Run around in circles and jump. You will jump higher and in a circle.
[Report]

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• Bookmark or Share Adventures of Jimmy Neutron Boy Genius: Attack of the Twonkies, The

Bookmark or Share Adventures of Jimmy Neutron Boy Genius: Attack of the Twonkies, The on GameCube