Coleco in the context of "Coleco Telstar series"

A handheld game console, or simply handheld console, is a small, portable self-contained video game console with a built-in screen, game controls and speakers. Handheld game consoles are smaller than home video game consoles and contain the console, screen, speakers, and controls in one unit, allowing players to carry them and play them at any time or place.

In 1976, Mattel introduced the first handheld electronic game with the release of Auto Race. Later, several companies—including Coleco and Milton Bradley—made their own single-game, lightweight table-top or handheld electronic game devices. The first commercially successful handheld console was Merlin from 1978, which sold more than 5 million units. The first handheld game console with interchangeable cartridges is the Milton Bradley Microvision in 1979.

Tank is an arcade game developed by Kee Games, a subsidiary of Atari, and released in November 1974. It was one of the few original titles not based on an existing Atari property developed by Kee Games, which was founded to sell clones of Atari games to distributors as a fake competitor prior to the merger of the two companies. In the game, two players drive tanks through a maze viewed from above while attempting to shoot each other and avoid mines, represented by X marks, in a central minefield. Each player controls their tank with a pair of joysticks, moving them forwards and back to drive, reverse, and steer, and firing shells with a button to attempt to destroy the other tank. The destruction of a tank from a mine or shell earns the opposing player a point, and tanks reappear after being destroyed. The winner is the player with more points when time runs out, with each game typically one or two minutes long.

Tank was designed by Steve Bristow, who had previously worked with the founders of Atari on Computer Space, the first arcade video game, and was developed by Lyle Rains. It was created as part of Bristow's vision to move the company away from only producing copies of Atari's games into also developing original titles. The game's cabinet was designed by Peter Takaichi. In September 1974, during development, Atari merged with Kee. The game was commercially successful, selling over 10,000 units and buoying Atari's then-troubled finances. It led to a cocktail cabinet release of the game and to three sequels: Tank II (1975), Tank 8 (1976), and Ultra Tank (1978). A dedicated console version of Tank II was announced in 1977 but cancelled later that year; the joysticks for the game, however, became the standard joystick controllers for the Atari 2600 (1977). Variations on the game were included in the Atari 2600 game Combat, as well as in the Coleco Telstar game Telstar Combat!, both in 1977.