   Relativity in games
  I only have a very basic understanding of the theories of relativity but it occurred to me one day that it would be impossible to make a multiplayer game where the physics would be "correct" because time dilation cannot be simulated for more than one player. Is this correct? Have there been any attempts to create a multi or single player game with Einsteinian physics?   
  IIRC this topic has already been discussed before on gamedev forums. I haven't the time now to search it, but you should be able to find it. Perhaps there you can read some useful reply.You may want to start from  here 