Namco Museum Battle Collection Cheats 

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Galaga Arrangement: Better upgrades:
To get 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 will then get an ultra upgrade. Try using different bugs.

Galaga Arrangement: Ship select:
After finishing the game (the last level is level 6-5) you will unlock ship selection in Free Play mode. This allows you to select a ship upgrade before starting a level.