BioShock 2 features multiplayer for up to 10 players which was developed independently from the single player by a different developer and tells the story before the first game. By gaining ranks for kills and winning matches, the player unlocks access to additional radio messages advancing the story behind the civil war that raged in the city between the Splicers and Andrew Ryan's security force. The available multiplayer-mode include Deathmatch, Team-Deathmatch, Capture and Hold, Capture the Sister and Adam Grab. The latter requires the players to collect and protect the sole Little Sister in the level in order to gain points. Capture the Sister on the other hand puts two teams against each other with one team trying to bring the Little Sister to a vent and the other trying to prevent that. Each mode also features the possibility of one player slipping into the role of a Big Daddy.