GSC Game World is a Ukrainian video game developer temporarily based in Prague. Founded in Kyiv in 1995 by Sergiy Grygorovych, it is best known for the Cossacks and S.T.A.L.K.E.R. series of games. GSC Game World was the first company in Ukraine to localize PC games to the Russian language. In 2002, it became a publishing house, GSC World Publishing. Source: Wikipedia (en)