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8h ago

Slay the Spire 2 Replaces Broken RNG After Community Research

Mega Crit says the new random number system removes detectable correlations that let players predict unrelated outcomes and restores fair randomness.

Slay the Spire 2’s ‘randomness’ is broken, you’re not just being superstitious
A huge Slay the Spire 2 update makes life harder but fairer, and adds Steam mod support
Left: Neow, a giant whale in Slay the SPire 2. Right: The Aeonglass, an ominous hourglass and Act 3 boss.

Overview

  • Mega Crit shipped update 0.107.1, which went live Friday, June 19, 2026, and replaced the game's RNG implementation while saying the new system produces evenly distributed results with no human-detectable correlation.
  • The change came after community analyst tckmn published a long, data-driven investigation and stream that showed multiple in-game PRNGs were correlated, and the studio publicly credited tckmn for uncovering the flaw.
  • The investigation documented concrete player-facing effects, including a reported 54% chance to draw the Debt curse from Neow's Bones in the Underdocks versus 0% in Overgrowth and examples of some cards appearing effectively unobtainable in the prior build.
  • Alongside the RNG rework Mega Crit removed the Doormaker boss and added Aeonglass, launched a Bestiary, enabled Steam Workshop mod support, and applied broad balance and bug fixes in the same update.
  • The fix addresses a technical cause where multiple PRNGs were derived from the same run seed so their outputs correlated, a known risk with naive seeding that Early Access testing and community data mining helped expose and correct.