Isonzo is inspired by the Battles of the Isonzo on the Italian Front which took place between 1915 and 1917. The game includes historically accurate World War I weapons, authentic uniforms and equipment, detailed injury and gore modeling, and maps based on the real battlefields of the Southern Front.[4][5]
The game runs on the Unity engine and was initially developed by independent studios M2H and BlackMill Games. Since the purchase of the series by Focus Entertainment, the game is being developed solely by BlackMill Games.[6][7]
The first free update was released on December 5, 2022, for all platforms: the Caporetto Update added a new Offensive with one map to the game, and a new German faction with their own weapons, equipment and uniforms. Later free updates added two further maps to the new Caporetto Offensive, the Monte Piana map in a separate Mountain War Offensive, a Marmolada map featuring the 'Ice City' built into the Marmolada Glacier, and a special Ascent game mode where Italian mountaineers climb a mountain to capture an Austro-Hungarian command post. The most recent free update was released on April 10, 2024.[8][9][10][11][12][13][14][excessive citations]