Hearthstone: One Night in Karazhan’s Opera wing is live now

It’s showtime in Karazhan.

The second wing for Hearthstone: Heroes of Warcraft’s latest adventure, One Night in Karazhan, is now live. It gives players new bosses to fight and (more important) new cards to earn. Hearthstone generates approximately $20 million a month from in-game purchases and is the biggest hit in the $1.2 billion digital card game market. New content like this keeps players engaged and more likely to keep spending money.