Players can team up with an AI companion in single player mode or a human friend in two-player co-op. Co-op tactics are made aware to the player in what is known as the co-op playbook. Unlike the original game, which in some instances limited the use of some tactics to certain situations, in The 40th Day, players have access to all tactics. Multiplayer Modes
In addition to its single player campaign, Army of Two: The 40th Day offers a robust, region-free, multiplayer experience that provides an array of unique features for up to 12 players at a time. I love the weaponry and cutscenes and dialogue already in this game. Now for my ratings STORYMODE 5stars, GAMEPLAY 5stars, GRAPHICS 4STARS, MULTIPLAYER 5stars and CO-OP 5stars. This one kick-ass game you won’t regret. ARMY OF TWO: THE 40th DAY 5stars
The sequel makes many improvements over the original game while still managing to maintain the best parts of the previous game. This time around if you’re playing in solo campaign mode your AI partner is much more intelligent.

Other improvements to the game play include the use of the shield. Once you beat the game you can unlock different outfits for both Rios and Salem including the original Ao2 gear.

Great things from the 1st game that have returned include the aggro meter. Whichever player has the highest Aggro rating will attract all the enemies towards them.