Blizzard’s new Warcraft-inspired card game soft-launched on iPad in early April, and was released worldwide earlier this week as a free download. However, in less than a day the game took the App Store by storm, quickly becoming the top application in the Top Free Apps charts in many markets. According to data provided by App Annie, Hearthstone: Heroes of Warcraft is now the No. 1 free app in 38 markets where the App Store is available to customers, including the U.S. When looking at iPad games only, the app is No. 1 in 40 countries. Hearthstone quickly dethroned previous title holders, including Microsoft’s recently launched Office for iPad suite of productivity apps, but also many other free-to-play games. Hearthstone