Multiplayer is an objective-based game mode, in which players are split into two teams – Axis and Allies. Each team has a set of objectives to complete, the Allies usually being to destroy some sort of Axis objective, and the Axis objectives being to defend their objectives. These objectives are split into two categories, primary and secondary. Primary objectives are ones which must be completed for victory, generally stealing secret documents or destroying a radar array; however secondary objectives are ones which are optional – they do not have to be completed, but if they are they may aid the appropriate team, such as blowing out a door to allow access into a tunnel which shortens travel time or allows less-noticeable infiltration of the enemy base.