Blizzard Entertainment has created video games.
Blizzard Entertainment , Inc. is an American video game developer and publisher based in Irvine , California , and is a subsidiary of the American company Activision Blizzard . The company originally concentrated primarily on the creation of game ports for other studios before beginning development of their own software in 1993 with the development of games like Rock n ' Roll Racing and The Lost Vikings . Their most recent projects include the first expansion for Diablo III , Reaper of Souls , the online collectible card game Hearthstone : Heroes of Warcraft , the sixth expansion for World of Warcraft , Legion , the multiplayer online battle arena Heroes of the Storm , the third and final expansion for StarCraft II : Wings of Liberty , Legacy of the Void , and the multiplayer first-person shooter Overwatch .