World at War will make leaps for the series as the game will feature Co-op missions, most likely a stepping stone for Call of Duty series. It will also feature squad gameplay not unlike of Brothers in Arms series of video games. It is also said to have a destructible environment. To help simulate the different style of warfare used by the Japanese, Treyarch has completely re-tinkered the enemy AI in World at War. Instead of taking cover and flanking in traditional European battle strategies, the Japanese hide in trees, sneak through the overgrowth and scrabble, katana in hand, in violent suicide attacks. The player will also be able to swim.