Sensor Tower: Kobolds & Catacombs doubled Hearthstone’s mobile revenues

According to the mobile data and insights company Sensor Tower, Hearthstone’s Kobolds & Catacombs expansion has doubled the digital card game’s mobile revenues in the five-day period after its launch on December 7. This is compared to the five days before launch.

Hearthstone is a free-to-play game that’s also available on PC. It makes money by selling digital card packs along with a handful of cosmetic skins. Expansions add new cards (typically, 135 of them), which helps drive pack sales.