Worms Forts: Under Siege is a 3D artillery tactical game. it was designed by Team17. Like the previous Worms game, it is in complete 3D and showcases new features, such as buildings. While the primary method of victory is to destroy the opposing team, victory can also be achieved by destroying the opposing Stronghold, the most important building in the game. It is the second game in the series to carry both a T rating from the ESRB and a 3+ rating from PEGI.
Players can build a variety of structures or buildings to increase efficiency. Players can also fire from these structures, and buildings can be unlocked based on players' performance.