Me and My Katamari cheats and cheat codes for Sony PSP

Unlock soundtracks:
You can found Sound test in the Vacation Memorial.
Completing the missions will unlock new songs in the Sound Test.
You can select the songs for play while you play with any mission.

Unlocks:
Finish the Game to unlock Blue Orb and Song For King of Kings.

Unlock 2D Katamari Damacy mini-game:
First finish the final "Crown" level at the Prince island. 
When the King speaks, during the ending sequence, a short level 
based classic style mini-game will start.
You can control with the following buttons:
O - jump 
D-pad - move

Eternal mode (no time limit):
Reach more than 80 points as your second score at the end of any normal mode 
level to access that level's Eternal version.

Change name board:
Collect all 2,434 objects (100% object collection), then the island's name 
board will appear on a strobe light name board.

Katamari Damacy Evening level:
Finish the Katamari Damacy mini-game. 

Katamari Damacy Night level:
Reach the Castle in the Evening level of the Katamari Damacy mini-game.