Blizzard just announced pricing details for Hearthstone's first single-player mode, Curse of Naxxramas, which they plan to release this month for PC and iOS.
There are five wings in the collectible card game's first dungeon—yes, it's a card game dungeon!—and you can buy them either separately or in bundles. They'll open for purchase gradually in the weeks after Curse of Naxxramas launches. Via Blizzard:
Naxxramas will open its gates one wing at a time, with a new wing opening each week. The wings of Naxxramas will open in the following order: Arachnid Quarter, Plague Quarter, Military Quarter, Construct Quarter, and Frostwyrm Lair.
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.
The pricing scheme is a little convoluted, but here's the gist of it:
In other words, if you want to use in-game gold, you're gonna have to spend 3,500 on all five wings (or 2,800 if you get the first one free). Considering that you could use that gold on card packs or Arena entry fees, it seems more practical to just spend real money on the expansion pack.
And indeed, it seems like the most effective way to get everything will be to download the first wing free, then spend $20 for the four-game package. Since you'll be getting cards when you play through Naxxramas regardless, it's a win-win scenario.
Smart, Blizzard. SMART.