Wolfenstein: Enemy Territory is a multiplayer spin-off to Return to Castle Wolfenstein. In this game, two teams battle each other through a series of three missions that make up a single campaign. There are two campaigns: North Africa and Northern Europe. Within a mission there are objectives that must be completed by each team. These are as varied as escorting tanks, building bridges, stealing gold, or blowing up fuel dumps. Each player picks a character class, such as engineer, soldier, field ops, or covert ops, and then makes use of that class's special abilities, class-specific weapons, and inventory items.