1UP writes: "The promised online criminal activity in Grand Theft Auto IV might seem like a revolutionary concept, but GTA games have featured cross-system multiplayer before. The two PSP entries, Liberty City Stories and Vice City Stories, each had deathmatch, racing, and capture-the-flag variants. And Jeronimo Barrera, VP of development at Rockstar, says that while the developers had fun with that multiplayer and learned what worked in the GTA world with it, they were limited by the system's power.
That's no longer the case with Grand Theft Auto IV. "We had planned multiplayer from the day we saw the specs of the consoles we'd be working on for this game," he says. "They would let us make something that was sufficiently interesting to stand alongside the single-player game." The result in GTA4 is a variety of modes -- including deathmatch and team DM, races, co-op play, and some specific team-based modes -- that all share one thing in common: "The freedom to do what you want, but [with] consequences for your actions," says Barrera."