Original version
Apple II
Developed by Dan Gorlin and published by Brøderbund Software in 1982. This is the original version of the game. The Apple II version was the first version ever developed.
Atari 400/800/XL
Developed by Dan Gorlin and published by Brøderbund Software in 1982.
Atari 5200
Developed by Brøderbund Software and published by Atari in 1984.
Atari 7800
Developed by Brøderbund Software, ported by Ibid, Inc. and published by Atari in 1987.
Atari XE Game System
Developed by Brøderbund Software and redeveloped by Steve Aguirre. Published by Atari in 1988.
ColecoVision
Developed by Brøderbund Software and published by Coleco in 1984.
Commodore 64
Ported by Dane Bigham, and published by Brøderbund Software in 1982. Published by Ariolasoft in Europe.
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Screenshot
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American box art
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European box art
Commodore VIC-20
Developed by Brøderbund Software and published by Creative Software in 1982.
FM-7
Developed by Brøderbund Software and published by Soft Pro International in 1984.
MSX
Developed by Brøderbund Software, ported by Compile, and published by Sony in 1984.
Sega SG-1000
Licensed from Brøderbund Software. Developed by Sega and published in 1985.
Arcade version
Arcade
Developed by Sega and produced in 1985. While heavily based on the original computer version, it is altered in a number of ways. It includes a score, and many elements appear immediately instead of over a period of time. There are stationary ground-to-air missiles that are scattered throughout the terrain. Barracks only hold up to either hostages. There are many different environments in addition to the standard desert environment.
Famicom
Ported by Jaleco and published in 1986. Based on the arcade version, but not as close as the Sega Master System version.
Sega Master System
Ported by Sega and published in 1986. Based on, and very faithful to the arcade version.