Ms. Pac-Man: Maze Madness

Professor Pac learns that the witch Mesmerelda has used black magic to seize control of the enchanted castle and wants to steal all four gems of virtue (generosity; truth; wisdom; courage) from there to control the "four wonders" (areas of Pac-land). He creates a device called Pactrometer that allows Ms. Pac-Man to go to these areas to retrieve the gems before Mesmerelda gets them first.