Army of Two is a third-person shooter video game series developed by EA Montreal. The first game in the series, Army of Two, was released on March 6, 2008 for the Xbox 360 and PlayStation 3 consoles. Focusing on cooperative strategies, Army of Two's main feature is the necessity to use coordinated teamwork to accomplish the game's goals. While the game is meant to be played with another human as a partner, a "Partner Artificial Intelligence" (PAI) is also included and programmed to follow the player's strategies. Dependence on a partner (whether human or PAI) is so pronounced that most objectives are impossible to complete without it. A sequel, Army of Two: The 40th Day, was released in January 2010 in North America and Europe. The third game in the series, Army of Two: The Devil's Cartel,