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:game: is a first person shooter which takes place in a zero gravity dimension where the player controls a ship through various environments, with mission objectives that must be completed to advance to the next area. The player is given a debriefing before each level that explains the mission for the level, and explains additional objectives that can be completed for extra points. These objectives usually involve destroying a power generator, destroying or activating a computer terminal, or eradicating alien presence from a vital area.
The game is divided into three episodes. "Theta-2" "Vengeance" and "The Void", each with 8 levels, and one hidden bonus level per episode. "Theta-2" was released as a shareware episode.