Sound the alarms and set your phasers to fun: Hearthstone’s first expansion is now available and ready to purchase from within the game.

We’ve talked about Curse of Naxxramas (and its wacky pricing) before, and like you, are pretty stoked for a new experience. Unlike the game’s primarily multiplayer focus, it looks as though Naxxramas should introduce a much-needed single player campaign (and even boss fights) in addition to a wealth of new cards.

If you’re not playing Hearthstone yet, now’s the time to start. You’ll be able to get the first of the Naxxramas’ five “wings” of content for free, but only for a limited time.

We’ll report back on our first impressions as soon as we’ve the time to make some. In the meantime, go play some Hearthstone! In-game gold to buy the rest of the expansion isn’t going to grind itself, you know.