Return to Castle Wolfenstein: Enemy Territory is a stand alone game with 20 new single-player missions, new multiplayer maps, and a new squad-based combat system. Enemy Territory is set in 1942 -- a year earlier than Return to Castle Wolfenstein -- and BJ Blazkowicz must uncover a Nazi plan involving giant cannons that can shell London from across the English Channel. Players will command small groups of soldiers, issue orders for the squad, and even give special commands to individual soldiers. Non-Player Character AI has been a focus for the developers; NPCs now intelligently avoid imminent explosions, respond to commands, and help lure enemies into ambushes. Multiplayer missions are sometimes combined into campaigns, allowing player teams to fight their way through multiple maps. Also, players gain additional abilities -- such as scouting prowess, or the ability to see hidden enemy mines -- as they progress through multiplayer battles.