ScrumbleShip is the most accurate space combat simulation devised to date. Gather resources, construct a capital ship out of individual blocks, then pilot it with AI or human help against other players.
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Found these on the testing server. Not entirely sure what they are, but Walloping said they looked like factories. We're not sure who built them either! Mysteries!
Cheers,
-Dirk
Ominous! ;]