The Olympic Entertainment Group (OEG), the largest casino operator in Central Europe and the Baltic states, has acquired a 80 percent stake in Casino Polonia. Over the next two years, the group plans to invest a total of 30 million euros in Poland. The transaction, worth 9 million euros, made OEG the owner of seven casinos in four Polish cities-Warsaw, Wroclaw, Szczecin and Gorzów Wielkopolski.