Due to Defender being one of the largest coin-ops of 1981, many home ports of the game followed starting with the version for the Atari 2600 in 1982
The game was created and distributed by Atari, along with being distributed by Sears with their own label for their stores.
Defender is an arcade video game developed and released by Williams Electronics in 1980. A shooting game featuring two-dimensional (2D) graphics, the game is set on a fictional planet where the player must defeat waves of invading aliens while protecting astronauts. Development was led by Eugene Jarvis, a pinball programmer at Williams; Defender was Jarvis' first video game project and drew inspiration from Space Invaders and Asteroids. Williams planned to display the game at the Amusement & Music Operators Association (AMOA) trade show, though development delays resulted in the team working on the game up until the show started.