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Undo Mod — Introduction

A powerful and stable Undo/Redo mod for Minecraft Fabric.

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About Undo Mod

Undo Mod provides full Undo and Redo functionality for Minecraft Creative mode players. Whether you misplaced a block, demolished a build by accident, or want to compare different designs — go back to a previous state with a single keypress.

Core Features

• Undo / Redo — Supports block placement, breaking, and state changes (trapdoors, levers, buttons, etc.)
• Cascade Reaction Capture — Chain reactions triggered by block changes (falling sand, vine growth, redstone updates, piston pushes) are bundled into a single undo operation
• BlockEntity NBT Restoration — Chest contents, furnace progress, brewing stand recipes, and more are fully restored
• HUD Display — Real-time display of undoable/redoable action counts

Operation Modes

Mode	Description
Block Only	Records only block operations — ideal for builders, leaner history
Full	Records block + entity + inventory operations — complete scene recovery

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Getting Started

Key Bindings

Key	Action
Backspace	Undo 1 action
Number(1~100) + Backspace	Undo N actions
Shift + Alt + Backspace	Undo all
Enter	Redo 1 action
Number(1~100) + Enter	Redo N actions
Shift + Alt + Enter	Redo all
U	Open settings
H	Open help
Mouse Back Button	Undo (must be enabled in settings)
Mouse Forward Button	Redo (must be enabled in settings)

Number Input Examples

Press 5 → Press Backspace → Undo 5 actions
Press 1 → Press 0 → Press Enter → Redo 10 actions
Press Backspace directly → Undo 1 action (default)
Shift + Alt + Backspace → Undo all

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Configuration

Without YACL (Basic)

• Press U to open the vanilla settings screen
• Options: Mouse Side Buttons toggle, Undo Mode (Full / Block Only)
• Config file: config/undo-client.json

With YACL (Full)

• Press U to open the YACL configuration screen
• Additional options: HUD corner selection, history stats, usage hints

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Installation

1. Install Fabric Loader and Fabric API for your MC version
2. Place the matching MC version JAR into .minecraft/mods/
3. (Optional) Install YACL v3 for the full config GUI, or download the -bundled JAR
4. Launch the game and press U to configure

Dependencies

Component	Main JAR	Bundled JAR
YACL v3	Recommended (install separately)	Built-in
Fabric API	Required	Required

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Tech Stack

• Loader: Fabric
• Java: ≥ 21
• Build: Gradle + Fabric Loom