Hearts of Iron (HoI) is a gran strategy computer game developed by Paradox Entertainment and Strategy First, set in the years 1936-1948. In the game you can control any one nation as World War II unfolds. It was released for Windows-compatible PCs in 2002. A Macintosh version was also released by Virtual Programming. The lead game programmer was Johan Andersson. A sequel to Hearts of Iron, Hearts of Iron II, was created and released with several changes in the tech tree and gameplay.