Hearthstone: Heroes of Warcraft’s fourth Blackrock Mountain wing — Blackwing Lair — is live

Let’s keep card-battling our way up the mountain.

Blizzard has unleashed the fourth part of its latest add-on for Hearthstone: Heroes of Warcraft. Blackwing Lair is live now as part of the weekly release of new content from the Blackrock Mountain adventure. You can purchase access to this episode right now for $7 or 700 in-game gold pieces. Or you can buy all five wings at once for $25. Worldwide gaming revenues on mobile reached $30 billion in 2014, and Hearthstone is Blizzard’s attempt to capture some of that.