Jawbreaker

Jawbreaker is a Pac-Man clone programmed by John Harris for the Atari 8-bit family and published by On-Line Systems. Released in 1981 before an official version of Pac-Man was available, it was widely lauded by reviewers, and became a major seller. The story of its creation and Harris's Atari 8-bit implementation of Frogger form a portion of Steven Levy's 1984 book, Hackers: Heroes of the Computer Revolution.