Much like Naxxramas in World of Warcraft, Curse of Naxxramas in Hearthstone is a floating necropolis organized into different wings -- Arachnid Quarter, Plague Quarter, Military Quarter, Construct Quarter, and Frostwyrm Lair -- and a new wing will open each week during the launch event. The launch event is set to last for approximately one month, and each wing contains a set of bosses that must be defeated.
Successfully eliminating bosses will add new cards to a user's collection and unlock a Heroic mode. Defeating all of the bosses in Naxxramas on Heroic mode will unlock a new card back.
According to Blizzard, the expansion can be purchased via in-game gold or through real money, with each wing costing $6.99 or 700 gold. During the launch event, the first wing, Arachnid Quarter, will be available for free, and users can purchase the remaining four wings for $19.99. After the launch event, purchasing the full expansion will cost $24.99. Various packages are also available for users who want to use a combination of in-game gold and money.
Players who begin their adventures in Naxxramas during the launch event will gain free access to the first wing: the Arachnid Quarter. The launch event will last roughly a month or so, meaning you'll have plenty of time to get your foot in the door--we'll have more details to share about that later on. The web-choked corridors of the Arachnid Quarter are home to the bosses Anub'Rekhan, Grand Widow Faerlina, and Maexxna. Defeating these bosses will add new cards to your collection and give you a taste of the dangers that await you deeper inside Naxxramas.Hearthstone: Heroes of Warcraft for the iPad can be downloaded from the App Store for free. [Direct Link]
Hearthstone: Heroes of Warcraft for Mac can be downloaded from Blizzard's website for free.