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Deep Space: Operation Copernicus was the first 3D space shooter game I've played-- it has neither good plot nor long campaign games but it *does* offer many enemy types and diverse mission objective. This was the first game I played that includes *mouse support* that works rather well. Interestingly it was to be the only 3D shooter published by the makers of the famed Wizardry series.
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Deep Space screenshots
People who downloaded this game have also downloaded:
Warhead (from Activision), Wing Commander: Armada, Command Adventures: STARSHIP, Mechwarrior, Freespace 2