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Battlefield: Bad Company 2 Onslaught mode can be played with up to four players across four multiplayer maps - Valparaiso, Atacama Desert, Isla Inocentes, and Nelson Bay - redesigned with new lighting, time of day, added vehicles and other effects. E Battlefield: Bad Company 2 is expanding its award-winning multiplayer experience with the introduction of an all-new mode called "Onslaught".