Call of Duty: World at War is a first-person shooter video game released in 2008. It is the fifth installment in the Call of Duty series and is set during World War II. Players can experience both the Pacific and European theaters of war, featuring intense combat scenarios and a variety of weapons. The game includes a single-player campaign and a multiplayer mode, allowing players to compete against each other online. Additionally, World at War introduced the popular Zombies mode, where players fight against waves of undead enemies, adding a cooperative gameplay element to the experience.