Slay the Spire 2 Sold 4.6 Million Copies in Two Weeks — the Deckbuilder Genre Just Got Its Moment

Half a Million People Playing Cards at Once

Slay the Spire 2 hit Steam Early Access on March 5 and immediately became the kind of launch most AAA studios dream about. Within its first week, the game sold 3.3 million copies and peaked at 574,638 concurrent players — making it the biggest Steam launch of 2026 so far, ahead of both Marathon and Resident Evil Requiem. By week two, that number climbed to 4.6 million copies and roughly $92 million in revenue at its $25 price point.

For a deckbuilding roguelike — a genre that barely existed before the original Slay the Spire helped define it in 2019 — these numbers are staggering. This isn’t a shooter or an open-world RPG riding a marketing blitz. It’s a card game about climbing a tower, and half a million people wanted to play it at the same time.

Co-op Changes Everything (and Nothing)

The headline feature is 4-player online co-op, a first for the series. Players can team up with multiplayer-specific cards and synergies that don’t exist in solo play. It’s a smart addition — deckbuilders are notoriously solitary, and giving friends a reason to argue over card picks adds a social layer the genre hasn’t had.

But the solo experience hasn’t been sacrificed for it. The full single-player mode returns with five characters: the returning Ironclad, Silent, and Defect, plus two newcomers. Necrobinder fights alongside Osty, a massive skeleton hand that can attack and block independently. Regent forges a sovereign blade and uses a unique “stars” resource to power certain cards. Both add genuine mechanical depth rather than just cosmetic variety.

The Spire Has Branches Now

The biggest structural change is branching acts. Instead of the original’s fixed Act 1 → 2 → 3 progression, each act now has two randomly selected variants with different enemies, events, and bosses. Act 1 might be Overgrowth — mystical ruins overrun with flora and fauna — or Underdocks, the Spire’s sewer system crawling with mutant sea creatures. This effectively doubles the variety of any single run and adds a layer of strategic adaptation that the original lacked.

At Early Access launch, the game already has 575+ cards, 278 relics, and 63 potions — more content than the original shipped with at 1.0. Mega Crit plans to add alternate versions for Acts 2 and 3, Steam Workshop support, Twitch integration, and a phobia-friendly accessibility mode during the Early Access period, which is expected to last one to two years.

The Risk of Early Access Royalty

With a 94% “Overwhelmingly Positive” Steam rating and players already logging over 25 million runs in week one, Slay the Spire 2 could coast on momentum alone. The real test is whether Mega Crit can sustain that pace — the original took years of careful updates to reach its final form, and a sequel with co-op and branching acts has far more moving parts to balance.

Developer Casey Yano acknowledged the pressure, noting the team is overworking but in “high spirits.” Console players will have to wait for the 1.0 release, expected sometime in 2027 on PS5, Xbox, and Switch 2. For now, this is a PC event — and by every measure, the biggest thing to happen to card games since the original taught an entire generation what “roguelike deckbuilder” means.