Do-Over: Quit Without Saving

By
TheKryzzz_

Leave a singleplayer world without saving: undo everything that changed since you joined, TNT craters and all.

Burned your house down? A creeper took out half the base? Walked the wrong way for an hour? Leave the world without saving, and it will be exactly as it was when you joined.

Clicking Quit Without Saving… in the pause menu opens the Do-Over screen

How to use it

The pause menu gets one more button under "Save and Quit to Title": Quit Without Saving…. It opens a screen with two choices:

Quit Without Saving: back to the title screen, and the world is as it was when you joined.
Undo and Play Again: the same, then the world opens again right away.

Leaving the normal way keeps everything, as usual.

Everything that changed during the visit goes back: blocks, items, inventories, mobs, time of day, advancements and stats.

How it works

The game keeps saving as it always does. Before a file in the world folder changes for the first time, the mod puts its old copy into .do-over inside that folder:

small files (level.dat, player data, stats, data/) are copied when you join;
region files are copied only when the game first opens them, so a big world isn't copied in full, only the parts you visit.

"Save and Quit" deletes the copies. "Quit Without Saving" puts them back and deletes files that appeared during the visit.

If the game crashes, the copies stay, and the next visit carries on from the same point. That visit can still be undone back to where the lost one began.

Good to know

Singleplayer only. The mod is client side; on a server it either doesn't load or does nothing, so it is safe in a modpack.
No Fabric API needed.
If another mod keeps large files inside the world folder, they are copied every time you join, which can make joining slower.
Translated into 25 languages: English, Russian, Ukrainian, Belarusian, German, French, Spanish (3 variants), Portuguese (2), Italian, Polish, Czech, Turkish, Dutch, Swedish, Hungarian, Romanian, Japanese, Korean, Chinese (simplified and traditional), Vietnamese, Indonesian.

Versions

Minecraft 1.7.10, 1.12.2, 1.14.4, 1.15.2, 1.16.5, 1.18.2, 1.19.2, 1.20.1, 1.21.1, 26.1, 26.2 and 26.3 on Fabric, Forge and NeoForge (Legacy Fabric for 1.7.10 and 1.12.2).