 It has remained popular enough with fans to spawn an open-source version from the original developers at Strategic Visions in 2005, which was downloaded from Sourceforge between 2005 and 2017 over 90,000 times.Some of the improvements mentioned above have made the game less difficult.While Strategic Visions worked to accurately simulate space launches and the act of running either space program, they made a number of simplifications for balancing as well as for the game to make sense.