Which Pac-Man sequel has Pac-Man eat keys to open maze doors?

Super Pac-Man is the Pac-Man sequel in which Pac-Man eats keys to open maze doors.

Released in arcades in 1982, Super Pac-Man changed the original game’s simple dot-clearing formula. Keys are placed around the maze, and collecting one opens a corresponding locked door. Behind those doors are food items and other prizes that Pac-Man must clear to complete the stage. As levels advance, keys increasingly open doors farther away rather than nearby ones.

The game also introduced Super Energy Pellets. Eating one temporarily transforms Pac-Man into a larger, faster version that can pass through doors without unlocking them and withstand ghost attacks. This is a common source of confusion: regular Pac-Man needs keys, while Super Pac-Man can bypass doors during his powered-up state.

Super Pac-Man was developed and published by Namco, with Toru Iwatani returning as designer. It is generally identified as the official sequel to the 1980 original, distinct from Ms. Pac-Man, which was an unofficial American-developed sequel commissioned by Bally Midway.