Six new missions for the Alliance have been added to the campaign, and it is now possible to play it in co-op with up to six players.
New difficulty levels have appeared: extreme "Brutal" and simplified "Easy". An interactive encyclopedia and a new multiplayer map, Battle Lab, for 2v2 battles have been added. The balance of factions, game mechanics, and technical errors have been improved.
Combined Arms is a completely standalone free game on the OpenRA engine that does not require the original C&C and Red Alert, which EA has been distributing for free since 2008. Players participate in a war of four factions: NOD, GDI, the Alliance, and the Soviets. The campaign combines different universes in a conflict with a storyline.