Before you start a battle, set one of the COMS into a player, and make sure that player is in your team (Team A, Team B, etc) A team of up to 3 players can be made!
This page contains co-op info for Advance Wars: Days of Ruin on the Nintendo DS. All information about Advance Wars: Days of Ruin was correct at the time of posting. Information is subject to change. If you see any errors please email us.