Command & Conquer: Blue Alert is a set of cooperative maps that covers the original Allied and Soviet campaigns of Command & Conquer: Red Alert. Each mission has been modified to accommodate two players. This map pack is only compatible with the CNCNet version of Command & Conquer: Red Alert, which includes a special parameter that allows singleplayer aspects of the game to be used in multiplayer maps. Only one map version per mission has been included, and the maps feature a number of modifications to balance their difficulty and avoid issues such as ore being depleted too quickly.