A spin-off of Rainbow Six Siege , Extraction is a cooperative multiplayer game in which players must work together to combat and defeat a type of parasite-like aliens called the Archaeans. Each play session, known as an "incursion", is made up of three interconected sub-maps, and players will be assigned any one of the twelve objectives randomly in each sub-map. The location of the objectives and the placement of enemies are procedurally generated. If an operator is taken down by enemy, they will become missing in action, and players cannot play as them until they have rescued them in an extraction mission. Characters which are severely injured in the previous mission will also remain hurt and will only recover slowly. Many operators from Siege return in Extraction, as they have formed the Rainbow Exogenous Analysis and Containment Team in order to contain the alien threat. Before the commencement of any mission, players can choose their operator from a pool of 18. Team composition is essential for success, as the players in the same session must select three different characters. Like Siege, players can send out recon drones to scout the area, reinforce doors and windows to seal entrances, and shoot through walls. The game has a ping system which allows players to reveal the locations of hostile threats and resources to other players. The aliens featured in the game are called the "Archaeans". In addition to the standard enemies, there are also special variants, such as the spikers that can shoot sharp projectiles from their body, and rooters that can slow the player down significantly.
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