The Total Simulation Series is a line of interactive 3D offline and massively multi-player online PC and MAC games that includes a combat flight simulator, tank simulator and other vehicles from World War I through the end of World War II. All our combat simulation games can be played offline indefinitely. But to really feel the exhilarating pace and challenge of our games, sign up for a free one month account and try your hand in realistic flight combat simulation and ground battle simulation with the res