Unlike the original War where the players choose only the colors they want to play with, in War in Rio the participants have the fantastic possibility of choosing the armies in relation with the armed groups they will make use of. That allows the players to become even more involved in the play, defending their squads according with their own ideals.

(so that the play can have an ending, it is recommended to establish a distinction between reality and entertainment.)

The "BOPE" (Special Police Operations Battalion) is represented by the black armies, the "Comando Vermelho" (Red Command) by the red armies, the "Polícia Militar" (Military Police) is represented by the blue, the "Milícias" (Militias) by the white, the "Terceiro Comando" (Third Command) by the green and the "Amigos dos Amigos" (Friends of Friends) by the yellow armies.