Namco Museum - Platform: XBox

Galaga Arrangement Display game time
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Press Left, Right, Left, Right, Up, Down, Up, Down at the Galaga 
Arrangement title screen. 

Pac-Man: Pac-Attack game
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Select Pac-Man at the games screen. Get over 25,000 points during 
game play to unlock Pac-Attack at the games screen. 

Ms. Pac-Man: Pac-Mania game
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Select Ms. Pac-Man at the games screen. Get over 20,000 points 
during game play to unlock Pac-Mania at the games screen.

Unlock Pac-Attack
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Get over 25,000 points in Pac-Man to unlock Pac-Attack. 

Unlock Pac-Mania
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Get over 20,000 points in Ms. Pac-Man to unlock Pac-Mania. 

Game Time in Galaga Arrangement
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At the Galaga Arrangement title screen, press 
Left, Right, Left, Right, Up, Down, Up, Down.