
So 2 players can share the same screen, and a further 2 players can join them via Online.
Local co-op (couch co-op) is capped at 2 players. Cooperative play has competitive elements, such as distribution of gold and loot not being automatic, and disagreements on quest progression triggering an in-game dispute. The host account makes progress, and the second account plays a Custom character (not a companion) but does not make progress on their own campaign. Launch the game on the host account, and have the secondary controller press start to begin playing. In order to play split-screen, players will need to have two controllers, as you cannot play with keyboard/mouse for one person and controller for another person. Local co-op (Couch co-op) is capped at 2 players. Please note there's no cross-platform multiplayer: Those playing on PC cannot play with PS4 or Xbox One Players, and PS4 and Xbox One cannot cross-play across platforms either. Players may enjoy split-screen "couch co-op" or join online sessions from other players, or any combination therein. Multiplayer is available in Divinity: Original Sin 2 in both online and offline versions.