526,793 concurrent players. Ninety-six percent positive reviews. Number two on Steam’s top sellers chart. And the game isn’t finished.

Slay the Spire 2 launched into Early Access on March 5, and in the three weeks since, it has done something no roguelike deckbuilder has ever done: become one of the biggest games on PC, full stop. Not “big for an indie.” Not “impressive for the genre.” Top four on all of Steam at its peak, trailing only CS2, Dota 2, and PUBG.

At its all-time high, 526,793 players were climbing the Spire simultaneously, according to data reported by PCGamesN. That is nearly five times the previous roguelike record, held by Mewgenics at 115,000. It crushed Hades 2’s 112,000. It beat Resident Evil Requiem’s 344,214 concurrent peak to become the biggest Steam launch of 2026 so far — and Capcom had a full console launch behind it. Even now, nearly a month later, 140,737 players are still playing concurrently, and the game sits at number two on Steam’s top sellers chart.

The Game That Built a Genre

The original Slay the Spire didn’t just popularize roguelike deckbuilders — it practically invented the commercial form. Since its 2019 full release, the genre has exploded. Monster Train, Inscryption, Balatro, and dozens of others owe a clear debt to Mega Crit’s design. The original game’s lifetime concurrent peak sat at 57,025 — a number it only reached three months ago, according to PCGamesN, after seven years of gradual growth.

The sequel blew past it in hours.

Here’s the part that should rattle every major publisher reading this: the first game still has legs. Despite Slay the Spire 2 being available, the original peaked at 36,207 concurrent players in the last 24 hours, per PCGamesN. That is not nostalgia traffic. That is a dedicated playerbase that genuinely hasn’t moved on.

Why Everyone Showed Up Before 1.0

Mega Crit has been upfront about what Early Access means here. The game already contains more content than the original, according to the developer’s launch announcement, but more cards, events, environments, and enemies are on the way. There is no timeline for full release. “We don’t have a specific timeline to share with you all,” Mega Crit wrote, “but we’ll be sure to keep you regularly updated and give you peeks behind the development curtain.”

Normally, “no release date” is a red flag. Here, it doesn’t matter. Players are showing up in record numbers because the core is already that good. PCGamesN noted that the sequel “at first glance feels more like a polish update for its predecessor, only to gradually unfurl its true nature before you” — new run structures, fresh mechanics, and a co-op mode supporting up to four players that feels more natural than anyone expected. “There are some questionable balance decisions, sure, but that’s why we’re here in early access,” their reviewer added.

The Reviews Say Everything By Saying Almost Nothing

The top-voted Steam reviews tell you more about this game than any 2,000-word critique could. The highlights are short, enthusiastic, and overwhelmingly positive — players aren’t writing essays, they’re playing.

People aren’t writing essays. They’re playing. The game has accumulated 39,693 reviews at 96% Overwhelmingly Positive — 38,123 positive, just 1,570 negative. That’s a rounding error at this scale. The playerbase has collectively decided the game speaks for itself.

Chasing Records Nobody Expected

Mega Crit co-founder Casey Yano publicly admitted he “didn’t think we’d actually pass Marathon in concurrent users.” Bungie’s Marathon peaked at 88,337. Slay the Spire 2 hit six times that number. The developer joked about chasing Hollow Knight Silksong’s all-time Steam record of 587,150. At 526,793, the gap is roughly 60,000 players — close enough that the punchline is wearing thin.

For a $25 indie deckbuilder to be breathing down the neck of one of the most anticipated games of the decade is not a feel-good underdog story. It’s a flat-out demolition.

Mega Crit’s response has been genuine disbelief. “Our team is totally blown away by the amount of people who have been playing and sharing their love for the game we’ve been working on for the past half decade,” the studio wrote. “Also obligatory joke: we’ll getcha one day, Silksong.” At this pace, that joke might need an update.

The Ceiling Just Moved

Every roguelike deckbuilder that launches after Slay the Spire 2 has a new problem. Not on quality — plenty of games in this space are excellent. On reach. When the genre’s flagship pulls half a million concurrent players, the ceiling for what a card game can do on Steam is no longer theoretical.

The genre isn’t niche anymore. Mega Crit just proved it — before the game even shipped.

Sources