To mark the release of Hearthstone, Blizzard released the Hearthsteed mount for World of Warcraft players that is obtained by winning three games in Arena or Play mode. Widely advertised on various World of Warcraft websites, this promotion encourages players to try Hearthstone, and marked the first significant crossover implemented between Blizzard games. Since then, multiple promotions have been implemented in other Blizzard titles such as Diablo III: Reaper of Souls, Heroes of the Storm,New Heroes of the Storm Themed Card Back, Hearthstone Mount in Heroes of the Storm. Retrieved May 11, 2015. StarCraft II: Legacy of the Void PRE-PURCHASE STARCRAFT II: LEGACY OF THE VOID AND PLAY THE “WHISPERS OF OBLIVION” PROLOGUE TODAY Retrieved July 15, 2015. and Overwatch.Overwatch is not free-to-play, all versions come with 21 heroes. November 6, 2015. Retrieved March 14, 2016.
