Subspace is a free, massively multiplayer online space action game. The player takes on the form of one of eight different ships, with varying armaments and capabilities. Combat is fought between players of different 'frequencies'. This simple ruleset forms the basis of a potentially very complex game. There are many servers for Subspace; the one I spend my time on is called Trench Wars. TW has a generally instakill configuration, which leads to some very fast-paced gameplay, yet leaves room for a lot of strategy.

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