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Defender is an old DOS science fiction shooter game, developed by Williams Entertainment, designed by Eugene Jarvis, Larry DeMar and published by Atarisoft in 1983. Defender is considered to be an arcade classic. It's available for download. Defender is also part of the Defender series.
How to play Defender
CTRL+F11: slow down emulation, CTRL+F12: speed up.
Press G to begin the game in keyboard mode.
Defender runs using Emularity.