Hell Let Loose is a multiplayer first-person shooter set during World War II. The game emphasizes teamwork and strategy, featuring large-scale battles with up to 100 players. Players can choose to fight for either the Allied or Axis forces, utilizing various roles such as infantry, tank crew, and support. The gameplay focuses on capturing objectives and controlling territory, with a realistic approach to combat. Players must work together to coordinate attacks and defend positions, using a mix of tactics and communication. The game also features destructible environments and a dynamic battlefield, enhancing the immersive experience.