After completing all the levels on Pac-Man, eat all the ghosts before returning to the numbered side. Then, you can roam around the board without any ghost catching you.

Bandai Namco hints at reviving classic titles like Ms. Pac-Man, Galaga, and Splatterhouse, following SEGA's lead. Rising game development costs prompted Bandai Namco to cancel projects ...

Namco Networks America Inc. and mobile media provider Handmark ... The Pac-Man Fever games category include such classics as Pac-Man, Ms. Pac-Mac, Galaga, Dig Dug and Super Pac-Man.

Now just select a game and enjoy! Credit goes to GinsuVictim for posting this on the cheat page for Namco 20 Year Reunion: Ms. Pac-Man/Galaga - Class of 1981.