Outlaw

"Outlaw is a single-player arcade game by Atari Inc., originally released in 1976. It simulates an Old West fast draw duel between the player and the computer. Outlaw was a response to Midway's Gun Fight, released the year before.

A home console port was developed for the Atari 2600 by then-Atari employee David Crane. This version is more directly comparable to Midway's Gun Fight, allowing two players to engage in a shoot-out using the 2600's joysticks. There are also multiple types of game play, that differ slightly from the arcade version, in this Atari 2600 port. Among these game types include target practice and versions with obstacles that must be shot around or shot through."

Source: Wikipedia, "Outlaw_(arcade_game)," available under the CC-BY-SA License.