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Rating:
1. Unlock the Mewtwo Level
Start a 2P Stadium game, then go to the Trainer Selection screen. Using either the Control Pad or Control Stick, enter the following button sequence on Controller one: hold the Z Button, then press B Button, Up, L Button, B Button, A Button, Start, A Button, Up, R Button. The game will immediately begin on the Mewtwo Level if entered correctly.
2. Unlock the Very Hard Difficulty Level
Go to the Game Settings screen in 1P Stadium Mode. Hold the Z Button, then press L Button, L Button, A Button, B Button.
3. Unlock the Super Hard Difficulty Level
Go to the Game Settings screen in 1P Stadium Mode. Hold the Z Button, then press R Button, L Button, A Button, B Button.
4. Unlock Speed Marathon Mode
To increase the maximum speed of a Marathon game to 99, go to the title screen. Hold the Z Button, then press B Button, A Button, L Button, L Button.
5. Unlock Hidden Characters
Go to 2P Stadium mode, have both players hold the Z Buttons, then press the L and R Buttons simultaneously on the Trainer Selection screen.
6. Unlock All Puzzle Levels
On the title screen, hold the Z Button then press A Button, B Button, R Button, A Button, A Button, B Button, R Button, A Button. If the code is entered correctly, all of the puzzle levels will be open in the Puzzle University.