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Playstation 2 - Nano Breaker cheats

Unlock Splatter Mode, Keith and hard mode: Beat the game once
Unlock Jaguar: Complete the game with Keith.

New Game +:
Beat the game once. Make a clear file save. Load back the clear file. 
All combo chips, Boosters, and game stats are retained in New Game +.

Shooter game:
During the gameplay enter 
Up, Up, Down, Down, Left, Right, Left, Right, X, Circle.
(Only in Japanese version)