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Sony PSP - Namco Museum Battle Collection cheats

Galaga Arrangement: 

Ship select:
Finish the entire game (the last level is level 6-5), then you can access to 
the ship selection in Free Play mode. Now you can select a ship upgrade 
before starting a level.

Getting better upgrades:
Let your ship get stolen, then let another steal your ship. Kill one, get 
the power-up, then kill the other bug. 
You should get an ultra upgrade. You can try it with different bugs.
Submitted by Wolf