PES 2014 uses the Fox Engine, a cross-platform game engine built by Kojima Productions, believed to be designed for the next generation of video games. Unlike versions released on Windows and seventh generation home consoles, the PlayStation 2 version is not developed with the Fox Engine. It is also the last retailed PlayStation Portable game released in Europe and Mainland Asia. The mode also allowed some national teams which were unplayable in normal modes to compete, although these teams are also unlicensed, with made-up player names and incorrect strips. In March 2014, a downloadable content pack added the World Challenge mode to PES 2014. The World Challenge is a tournament similar to the FIFA World Cup, with national football teams taking part to compete for the trophy.