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STS 2 Guide

Alternate Acts Explained

Beginner
Mechanics
Updated on Mar 7, 2026
Mar 7, 2026

Overview

Slay the Spire 2 is shaking things up by doubling the amount of acts in the game. This is a huge change from the original Slay the Spire, creating far more variety between runs.

As you begin an act, you'll be confronted by one of two environments, each packing their own pool of Events, Monsters, Elites, and Bosses!

Early Access kicks things off with Act 1a (Overgrowth) and Act 1b (Underdocks), but we'll have to wait a little longer for Act 2b and Act 3b. While the exact dates are unknown, it's said to be during Early Access.

Act 1a - Overgrowth

slay the spire 2 act 1a overgrowth

Act 1b - Underdocks

slay the spire 2 act 1b underdocks

Act 2a - Hive

slay the spire 2 act 2a hive

Act 3a - Glory

slay the spire 2 act 3a glory

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