Hearthstone is a digital collectible card game released by Blizzard Entertainment in 2014, available for Microsoft Windows and macOS PCs and iOS and Android smartphones. The game is free-to-play, with players gaining in-game currency and card packs via winning matches and completing quests, while real-world money can be spent to acquire additional card packs and cosmetic items. The game has been critically well-received and financially successful, estimated to earn nearly US$40 million per month as of August 2017. As of November 2018, Blizzard has reported more than 100 million Hearthstone players. Blizzard has continued to expand the game with the addition of multiple expansions, adventures and game modes.
