I just played Dystopia, which is a very cool, free multiplayer game for the Source engine, meaning you need Steam (a content delivery service, which doesn’t suck at all) and a Valve game to play it. I recommend getting Half-Life 2 if you haven’t yet… if you have, well, then you already have everything you need to play Dystopia.
Dystopia plays a lot like Unreal Tournament III’s objective oriented matches with Half-Life 2 physics. It takes place on two levels: the real world, and the cyberworld, represented here much like it was in Johnny Mnemonic. Don’t worry, though. This game is a lot better than that movie and Ice-T doesn’t try to act in it.