Install Undertale in GDLauncher
Undertale runs on Forge. Pick whichever your existing instance uses, or create a new one. GDLauncher installs the correct loader automatically.
Install on Forge
- Open GDLauncher and create a new instance (the + button on the Library page).
- Pick the Forge loader and a Minecraft version that Undertale supports (1.17.1 are common choices).
- Open the new instance, go to the Addons tab, and click Add Addons.
- Paste the Quick Install ID
#undertale-in-minecraft, find Undertale in the results, and hit Download. GDLauncher pulls dependencies automatically. - Hit Play. That's it.
Before you install
Make sure your Minecraft version matches what Undertale supports. As of the latest release, 1.17.1 are supported. Undertale only runs on Forge; mods built for other loaders won't work. GDLauncher checks compatibility for you and won't install something incompatible with the instance you've chosen.
Frequently Asked Questions
Is Undertale free?
Yes. Undertale is free to download and install through GDLauncher. GDLauncher itself is also free and ad-free.
What Minecraft versions does Undertale support?
Undertale supports Minecraft 1.17.1. GDLauncher will automatically pick a compatible version when you install it.
Does Undertale require Forge or Fabric?
Undertale requires Forge. GDLauncher will install the correct loader automatically when you create an instance.
How do I install Undertale?
Open GDLauncher, go to your instance's Addons tab, click Add Addons, and paste the Quick Install ID #undertale-in-minecraft. GDLauncher handles dependencies and the right Minecraft version automatically.
Who made Undertale?
Undertale is made by Unkn0wn4all. The full project lives on CurseForge (https://www.curseforge.com/minecraft/modpacks/undertale-in-minecraft).
Need help?
Read our troubleshooting guide, check the guides section, or join the GDLauncher Discord community.