MTV Multiplayer writes: "Last week I re-reported my findings that "Grand Theft Auto IV" does not have split-screen multiplayer. While the game has more than a dozen multiplayer modes, those modes are made to be played over Xbox Live and the PlayStation Network.
Readers of my post asked if the game supported multi-system LAN play, or if it had any single-screen multiplayer gameplay that two friends could play with one system and one TV. The answer to each of those questions is "No." I've checked and double-checked this with Rockstar Games.
"GTA IV" multiplayer is all online or bust."