Curse of Naxxramas is Hearthstone's first adventure. Set in the Scourge necropolis of Naxxramas, Curse of Naxxramas is a five-wing adventure, with each wing representing one of the wings of the World of Warcraft Naxxramas raid instance. The adventure features a total of 30 new collectible cards, gained through completing various aspects of the adventure and a new battlefield. The wings of the adventure must be purchased with gold or real money before they can be played or their cards can be collected. The adventure itself comprises a series of unique boss battles distributed among the wings. Players are able to tackle bosses in several different difficulty modes: the basic Normal mode, the grueling Heroic mode, or Class Challenges bringing strategic twists to existing boss encounters using special pre-selected decks.

Into the Necropolis - The Arachnid Quarter Hope you’re not afraid of bugs, because the Arachnid Quarter is crawling with all kinds of multi-legged horrors that are just itching to make your acquaintance. Watch out when facing the bosses of the Arachnid Quarter, or you’ll soon see yourself become nothing but another careless fly caught in their cunning webs. The Plague Quarter There are two pretty good indicators you’ve set foot in the Plague Quarter: one, the feeling that you’ve just stepped into something that’ll necessitate an immediate change of footwear, and two, the unmistakable smell of Heigan. He’s the guy the other undead call “the Unclean.” The Military Quarter Atteeen-shun! The Scourge is an army, and the Military Quarter is where useless undead who don’t know which end of the stick to point at the enemy are turned into ministers of death, praying for war. The Construct Quarter The Construct Quarter is home to the most terrifying experiments in reanimation and foul necromancy ever attempted, and they’re always looking for new specimens. The Frostwyrm Lair The final challenge of Curse of Naxxramas. Only two bosses lie between you and ultimate triumph. All you need to do is defeat a giant flying undead dragon that breathes ice and eats adventurers for breakfast, and a cunning necromancer whose mastery of the dark arts has granted him immortality in undeath and who rules over Naxxramas with an iron fist.