Codebreaker is a video game released in 1978 by Atari, Inc. It was in the first wave of Atari VCS games to follow the original nine launch titles
It was one of three cartridges to accompany the introduction of the Atari keyboard controller, an add-on launched in response to claims of false advertising that the VCS is a "computer" (the other two were Hunt & Score and Brain Games).
The cover art for the game is by Chris Spohn, who created the cover art for many early Atari games.
There are three games, each with six variations: Bagels, Nim, and Mastermind. In each game the player must take turns to guess a numerical code and enter it using the keyboard controller.
The games may be played in single-player mode, or in a two-player mode where the players play together.