Someone mentioned Spacechem in the comments. I don't want to register there to comment, but Spacechem is pretty much all about synchronization of two threads of

Someone mentioned Spacechem in the comments. I don't want to register there to comment, but Spacechem is pretty much all about synchronization of two threads of execution. Also, it's worth noting someone actually built a Turing machine in it. I also wonder why Minecraft (and especially Redpower 2 mod) didn't get a mention. I also enjoyed Lightbot, btw. But someone should turn that to a real game, not just flash (bigger desk, larger program space).