"crunchy sweetened corn cereal with marshmallow bits"
Pac-Man Cereal hit the shelves in 1983, capitalizing on the huge success of the arcade game Pac-Man which had taken America by storm the since it's introduction in 1980. The marshmallows were shaped like Pac-Man, and the game's ghost characters: Blinky, Pinky, Inky and Clyde.
The cereal later introduced Ms. Pac-Man marshmallows with a "a shocking pink bow" and Super Pac-Man marshmallows which were just larger versions of existing Pac-Man marshmallows.
Send-away offers included a "Ghost Chomper" hat or Pac-Man game watch, entry details to win a full-sized Pac-Man arcade game or a mini electronic version of the game, a cut-out Pac-Man mobile, and send-away offers for a neon camera (in Canada), a Pac-Man bowl or a Pac-Man ring.
Animated children eating the cereal in commercials referred to themselves as "ghost chompers".