Blizzard's Hearthstone was the year's most addictive video game, a card game based on Warcraft that was got all the big things right (perfect, flawless balance) and added perfect little touches as well (make sure to make the rocket ship on the game board take off just once). Matchmaking was simple and easy, the series of emotes let gamers say just enough without letting them get abrasive, and while you could spend money in Hearthstone to by card packs, you never actually have to do so to be successful.