The most famous game of Blizzard and MMORPG genre, World of Warcraft, has evolved through years. But most of the players already missed the vanilla experience of World of Warcraft. In last years, there was a lot of private servers for vanilla WoW experience, but after Blizzard shut them down. World of Warcraft players start to demand for an official vanilla World of Warcraft experience. So Blizzard listen them and announce the WoW: Classic last year.