To activate the 10 keys, you simply have to access your Battlenet account and enter the code for each Deck Cards in "Add Product" Then, the next time you access HearthStone, you'll find 10 new packages. Hearthstones is a combat card game set in the World of Warcraft universe , Blizzard, and is highly addictive and fun, which will fight against players from around the world to achieve the best possible position in the world ranking.