CurseForge · Minecraft mod
user.exe404
this single minecraft has a lot of monsters and 2 biomes, the rest you can see for yourself!
Quick answer
Which user.exe404 release should I use?
user.exe404-1.0.0-forge-1.20.1 targets 1.20.1 with Forge. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.
Where it goes
Is user.exe404 required on the client, server, or both?
The project page does not say whether this file belongs on the client, dedicated server, or both.
The source does not explicitly classify this release as client-only or server-only.
What else does user.exe404-1.0.0-forge-1.20.1 need?
user.exe404-1.0.0-forge-1.20.1. Change the file and its required mods may change too.
This file does not list any required mods. Do not add a library just because a different file uses it.
This file does not list any required or optional mods.
Before you install it
Add user.exe404 without breaking your instance.
Built for user.exe404-1.0.0-forge-1.20.1. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use user.exe404-1.0.0-forge-1.20.1. It targets 1.20.1 with Forge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
The project page does not say whether this file belongs on the client, dedicated server, or both.
- 04
Pick the file you checked
Use the “Get this file” button beside user.exe404-1.0.0-forge-1.20.1. It opens that exact file at the source.
About this project
What does user.exe404 add?
#### 

Minecraft mod merging Error404 and Glith. Features new biomes: Diamondi and The User.error404, with digital anomalies. The 404 error adds a crash‑based system — once found, it spreads everywhere.
Project description from CurseForge.
Pick your setup
user.exe404 by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
Check the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
user.exe404 versions and loaders
user.exe404-1.0.0-forge-1.20.1
user.exe404-1.0.0-forge-1.20.1.jar
17 Apr 2026
Looking for an older file? The official CurseForge project page is in Resources.