Slay the Spire 2 was an immediate success, delivering a top-selling launch day performance. But as more data emerges, it's become increasingly clear that Slay the Spire 2's launch is a historic record-setter. According to Manu Rosier, director of market intelligence at Newzoo, PC Gamer's official data partner, StS 2 is the best-performing deckbuilder of all time—and it's leading by a massive margin.
Steam peak concurrent users, while a flawed metric for a game's ongoing health, provide the clearest image of how Slay the Spire 2 is separated from other card game heavy hitters by orders of magnitude. Balatro peaked at 44,000 concurrent users in January 2025, Slay the Spire 1 at 57,000 in December 2025, and Monster Train 2 at 18,500 shortly after its May 2025 launch. Three days after its early access launch, Slay the Spire 2 peaked at 575,000 concurrents.
