By early 1984, "InfoWorld" estimated that Epyx was the world's 16th-largest microcomputer-software company, with $10 million in 1983 sales. Many successful action games followed, including the hits "Impossible Mission" and "Summer Games". The latter created a long run of successful sequels, including "Summer Games II", "Winter Games", "California Games", and "World Games". The company produced games based on licenses of "Hot Wheels", "", and "Barbie". In Europe, U.S. Gold published Epyx games for the Commodore 64, and also ported many of the games to other major European platforms such as the ZX Spectrum and Amstrad CPC.