Been playing some Ms. Pac Man on the Genesis, very nice port overall. Has plenty of extra features the arcade original doesn't such as a difficulty selection, the option for extra speed (called the "Pac Booster" in game), and extra mazes.
The 3 button pad is s a bit unruly to control the game with, definitely use a 6 button pad if you can, as it has a better dpad for this sorta thing.