Levels contain fruit that can be eaten for bonus points, alongside letters that spell out "PACMAN". Collecting all of these letters in a level will unlock a secret bonus stage. Some levels require Pac-Man to retrieve a key to rescue one of his captive friends. "Galaxian" flagships found in certain levels; these allow Pac-Man to access a 3D maze themed after the world he is in. These mazes play similarly to the original "Pac-Man" and "Ms. Pac-Man", where Pac-Man will need to eat all the dots and avoid the ghosts. Completing these mazes will unlock them for replay from the main menu. Most levels also contain Pac-Man's nemeses, the ghost gang, which can be defeated by consuming large Power Pellets and eating them.