how many acts slay the spire has

Slay the Spire has 3 main acts , plus an optional Act 4 as a bonus final challenge.

Quick Scoop

• Acts 1–3 are the standard run structure.

• Act 4 unlocks only after you collect the three keys and beat Act 3.

• So the short answer is: 3 acts in a normal run, 4 total if you unlock the secret final act.

TL;DR: 3 main acts, 4 with Act 4 unlocked.