This is NOT a split screen co-op. It is shared screen (up to 4 players) hotseat co-op (meaning not online, but same console/screen). These are rare and disappearing gems as the industry tries to push towards online gaming. This game is AWESOME. Very customizable, very long, challenging, and fun. Zombies, monsters, aliens, etc. Play is similar to other 4-player hotseat co-op top-down console games like Marvell Ultimate Alliance, Gauntlet Dark Legacy, Baldur's Gate, Champions of Norath, etc. with up-to-date graphics and story. VERY highly recommended. My wife and I love to play it over and over.