This is both very interesting and a little painful for me. It's one of those ideas that I've always wanted to try, but never got around to. In a way it's nice that someone tried it anyway.

 With 0x10c around and discussions on space combat realism I was thinking about some form of semi-realistic space "naval battle"/wargame.So the first thing I thought was, well low-scale speed of light giving wonky graphics is both cool and help getting the feel of relativity, but what about some Homeworld or a Master of Orion type of game with relativity ingrained inside the game rules and mechanics? Probably the music sounding Homeworld-esque helped.
 I imagine it would be quite difficult to have working multiplayer relativistic mechanics. So far, I can only see single player mechanics working, which would restrict the appeal of such a game.
 Yeah, multiplayer without a unified sense of "time" doesn't seem to work very well...
 That's only partly true.Consider a turn-based game: a turn being irrevocably discrete and the same for all players, each entity, depending on its relative speed - hence time dilation/compression ratio - would get a different number of action points to spend each turn. You can globally compute each item action points because you're simulating the game universe.You can extend this to virtually continuous time by compressing/dilating time depending on the player's relative reference frame, and then you could cap the flow of time so that min_flow=real_time or max_flow=real_time, or even mean_flow=real_time. I could see this becoming a problem for say, a FPS game where the player would feel relativity as time slows down or goes faster, but for a much more global game applying such a scheme would make him witness each unit/planet/whatever relative reference frame time dilations/contractions from a sort of god-like reference frame. In a single player scenario (where you don't need base time flow synchronicity between players) this god-player could even change his own reference frame by scaling his base time flow between say min_flow and max_flow.
 I don't think it is quite that easy.Try modelling the twin paradox that way, for instance...
 I encourage you to look at Achron http://www.achrongame.com/ , a RTS with timetravel as an integral gameplay mechanic. It doesn't deal with relativity explicitly, but does have multiple independent timestreams.
 It was considered but there are some equations that still need to be worked out. We'd need to store the history of each player but I believe we decided it could be done.

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