WorldChange

Switch between your singleplayer worlds with a single command — no trip back to the title screen.

What it does

WorldChange loads another world from your saves folder while you're still in-game. It reuses Minecraft's own "play selected world" flow, so all you see is the normal loading screen — you never get kicked back to the menu.

• One command — /worldChange <name> switches you to that world instantly
• Works from anywhere — even while connected to a multiplayer server (it disconnects and loads your local world)
• Smart matching — finds worlds by name; the seed is optional and only needed to tell apart two worlds that share a name
• No surprises — clear in-game messages when a world isn't found, is locked, or is incompatible. It never crashes your game
• Vanilla look & feel — built entirely with Minecraft's native UI, no custom textures or decoration

World picker (Mod Menu)

Prefer clicking over typing? Open WorldChange from Mod Menu to get a clean, vanilla-style list of your worlds — one click switches. Worlds that can't be loaded (incompatible version, currently open, or locked) are shown but disabled.

Usage

/worldChange MyWorld          # switch by name
/worldChange MyWorld:12345    # add the seed when two worlds share a name

Compatibility

Loader	Fabric
Minecraft	1.21.10 · 1.21.11 · 26.1 · 26.1.1 · 26.1.2 · 26.2
Requires	Fabric API
Optional	Mod Menu (for the world picker)
Side	Client-side only — not needed on servers

Notes

• This is the first release (v0.1.0). Feedback and bug reports are welcome.
• Switching always saves your current world before loading the next one.