A Slay the Spire 2 mod that lets you undo card plays and turns during combat.
Misclicked a card? Played a power in the wrong order? Just press Z.
Nexus Mods: https://www.nexusmods.com/slaythespire2/mods/716
- Undo a single card play with
Z - Undo an entire turn with
Shift+Z— rewinds to the start of the current player turn - In-combat undo button next to the energy display (mirrors the
Zhotkey) - Works only inside an active combat — no undo after death, no undo on the map
- Up to 30 snapshots retained per combat
- Singleplayer only — the manifest declares
"affects_gameplay": true, so the game's mod loader disables this mod in multiplayer sessions. Don't try to use it in co-op; the rewind would desync from the other player's state.
The mod takes a deep snapshot of the combat state the moment any of these actions begin:
- Card play (
PlayCardAction) - End turn (
EndPlayerTurnAction) - Use / discard potion (
UsePotionAction,DiscardPotionGameAction)
Pressing Z pops the most recent snapshot and restores HP, block, energy, hand/draw/discard/exhaust piles, powers, relics, potions, orbs, monster intents, RNG, and visual state (spine animations, modulate, hitboxes, etc.).
This is a snapshot approach, not a command/inverse-op approach — picking the inverse of every status interaction in StS2 is not realistic, so it captures-and-restores instead.
| Key | Action |
|---|---|
Z |
Undo one step (last card / potion / end-turn) |
Shift+Z |
Undo to the start of the current turn |
You can also click the ↶ Z button that appears near the energy display.
Right-click and drag the button to move it; the position is saved to
%APPDATA%\Sts2UndoMod\settings.json (Windows) and applied on the next
combat. Delete that file to reset the position to default.
- Download the latest release
Sts2UndoMod.dllandSts2UndoMod.jsonfrom Nexus Mods or GitHub Releases. - Copy both files into:
<Slay the Spire 2 install>/mods/Sts2UndoMod/ - Launch the game.
Requirements:
- .NET SDK 9.0
- Godot.NET.Sdk 4.5.1 (resolved automatically via
Directory.Build.props) - A local Slay the Spire 2 install (auto-detected via Steam registry / standard paths by
Sts2PathDiscovery.props)
dotnet build Sts2UndoMod.csproj -c ReleaseThe build copies Sts2UndoMod.dll and Sts2UndoMod.json into <sts2>/mods/Sts2UndoMod/ automatically (CopyToModsFolderOnBuild target).
The mod writes a log to:
%APPDATA%/Sts2UndoMod/probe.log (Windows)
~/.config/Sts2UndoMod/probe.log (Linux/macOS)
Attach this when reporting issues.
This mod stands on the shoulders of earlier work. Big thanks to:
- JiesiLuo — author of
UndoAndRedofor Slay the Spire 2, the direct predecessor this mod is built on. The combat-state snapshot architecture and much of the groundwork comes from that project. - filippobaroni — author of
Undo the Spirefor Slay the Spire 1, which originated the core idea of full combat-state snapshots for undo. - MegaCrit — for Slay the Spire 2.
- HarmonyX — runtime patching library used by this mod (bundled with the game; not redistributed here).
MIT.