Codebreaker CX-2643 Atari 2600 Video Game Cartridge
Codebreakerwas one of the eleven Atari 2600 titles that were part of the second wave of games released in 1978. It is one of the first games to utilize the Atari Keypad controller.
It essentially consists of two different games, Codebreaker and Nim. The game of Codebreaker is identical to the game more commonly referred to as Mastermind (which itself is a recreation of a much older game called "Bulls and Cows.") In this game, players must try to guess the correct combination of numbers after being told how many digits in their guess are correct, and how many of those digits are in the correct place.
Nim is a far older game. The object of the game is to pick up the last object (or in some versions, to avoid picking up the last object) by systematically removing any number of objects from one particular column out of a set of available columns. Although it sounds simple in description, it can take some time to develop a proper winning strategy.