Fortress is a turn-based game where each player, as a tank, aims to shoot down another player's tank while avoiding shots from other players, turn by turn. Players can choose from a different range of weapons and tools, with the desired trajectory and power of the weapons

Fortress is a legacy franchise game that became a nationwide hit online game, garnering the title of the 'nation’s favorite game.' Until it's shutdown in 2020, Fortress gathered a cumulative user base of 24 million - which is almost half of the South Korean population.