Just when you thought you were over your Hearthstone addiction, Blizzard drags you back in again. Blizzard used their PAX East panel to unveil the first expansion to the Hearthstone card collecting game: The Curse of Naxxramas single-player adventure mode.

The expansion is based on the World of Warcraft dungeon of the same name. The Hearthstone dungeon will have five “wings” (section) that you have to play through. Doing so will allow you to earn new cards with up to 30 new cards up for grabs as you defeat the various characters and bosses you encounter.

With Hearthstone being a free-to-play game, the adventure mode does come with a catch. The first wing of the Naxxramas dungeon will be available to everyone. However, the remaining four wings require you to buy access to them using either in-game gold or real-world money. Blizzard hasn’t released the price of a dungeon wing but the current price of an Arena run is $2.49 or 150 gold.

In addition to the new cards, the expansion will come with class-based challenges that will require you to complete specific objectives to earn more cards. Reportedly, the most common challenge is using a pre-determined deck. There will also be a Curse of Naxxramas themed arena for you to play in and click around for Easter eggs.

The Curse of Naxxramas is expected to be released during the summer and will release on all platforms (Windows, Mac, iPad) simultaneously.

Sources: GameSpot