Namco Museum: 50th Anniversary Cheats

Fix the Out of Order Games
When you first start, you'll see two games that are listed as Out of Order. To fix them and make them playable, you must achieve a certain score in certain games. Once you have achieved the required scores (as indicated by the message bar when you first try to play them,) they will be available for play.

Pac-Mania - Score 15,000 points in Pac-Man and 20,000 points in Ms. Pac-Man
Galaga '88 - Score 40,000 points in Galaga