“Hell Let Loose” is a multiplayer first-person shooter video game developed by Black Matter Pty Ltd. and published by Team17. It was released in 2020 for Microsoft Windows and is set during World War II, specifically focusing on the battles between Allied and Axis forces.
In Hell Let Loose, players engage in large-scale, tactical warfare with up to 100 players on a single battlefield. The game emphasizes teamwork, communication, and strategic coordination to achieve victory. Players can choose between different soldier classes, each with unique roles and equipment, such as infantry, support, recon, tank crew, or officer.
The gameplay revolves around capturing and holding key objectives across realistic and historically inspired battlefields. The game features a dynamic frontline system that moves depending on which team controls the majority of objectives, creating a shifting front of battle.
Communication and coordination among squad members and team leaders are vital for success in Hell Let Loose. Players must work together to establish supply lines, set up defensive positions, coordinate attacks, and call in reinforcements to outmaneuver and defeat the opposing team.
The game aims to deliver an authentic and immersive World War II experience, with realistic weapon mechanics, vehicles, and environments. The maps are designed to resemble real-life locations from the war, and the game’s audio and visuals strive to recreate the chaos and intensity of battle. 
Hell Let Loose offers both competitive gameplay modes, such as Warfare mode with large-scale battles, and cooperative gameplay modes, where players can work together against AI-controlled enemy forces.
It’s worth noting that Hell Let Loose is continuously being updated and expanded upon by the developers, with new content, improvements, and optimizations being introduced over time.
Please keep in mind that the information provided is accurate as of my knowledge cutoff in September 2021, and there may have been updates or changes to the game since then.