The company offers 13 games, including ten MMORPGs, one casual massively multiplayer online game, and two strategy web games, which are designed on a free-to-play model. Users can play the games for free, but need to purchase virtual products and services within the game. Giant Interactive was founded in 2004 and successfully carried out an IPO on the NYSE in 2007, making it the largest Chinese private-owned company listed in the U.S. The company's focus is on MMO games and its free-to-play online game ZT Online was the most popular online game in China in 2006, according to a report published by IDC.