The story of Ms. Pac-Man is worthy of a documentary, which it got as a part of Netflix's High Score series (definitely worth watching). Though it was seen as a proper sequel to Pac-Man, the game was actually created by an upstart American company as an add-on board for Pac-Man cabinets, which they sold to Pac-Man's US manufacturer Midway. Ms. Pac-Man expanded upon the original's female fanbase, and added numerous improvements to the original game's formula, including multiple mazes, updated sound effects and graphics and semi-random ghost movement designed to prevent pattern memorization. The game became a huge hit in North America and is often considered superior to the original.