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Playstation 2 - Super Puzzle Bobble cheats

Unlock secret characters
Press Triangle, Right, Left, Triangle at the "Push Start button" screen. 
If you made correctly, a message will appear in the top corner.

Unlock another world
Press Triangle, Left, Right, Triangle at the "Push Start button" screen. 
If you made correctly, a message will appear in the top corner.
Select the puzzle mode and after the arcade mode to access 
more levels.