Command & Conquer: Red Alert 3 is a 2008 real-time strategy game developed by Electronic Arts Los Angeles. It is the third major installment in the Red Alert series and features the original two factions, Allies and Soviets, joined by the newly introduced Empire of the Rising Sun, a high-tech fictionalized Japanese army. Although co-op campaigns were not new to Command & Conquer games, as special co-op missions existed in Red Alert 2 and Yuri's Revenge, Red Alert 3 was the first (and currently only) Command & Conquer game to exclusively use co-op mechanics in the main singleplayer campaign.