Adds two new items to the game: minecraft:unstable_dupe_hack and minecraft:dupe_hack. Both are functionally identical, but the unstable version breaks after being used.
How to obtain:
- Unstable Dupe Hack: Kill any mob while holding a chest in your main hand. The chance of it dropping is based on which kind of chest you kill a mob with.
- Wooden Chest = 5%
- Copper Chest = 6% + 2% per oxidization stage, resulting in a max of 12%.
- Ender Chest = 25%
- Dupe Hack: Attempt to duplicate a Dragon Egg with an Unstable Dupe.
How to use:
- Put the item you wish to duplicate in your offhand.
- Right click with either Dupe in your mainhand.
- Your offhand item will be consumed, and two of it will be dropped at your feet!
Created with MCreator.
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Verified by MCModsHub
- Ships as minecraftdupe_hack-1.0.0-neoforge-1.21.1.jar — drop this file into the mods folder
- Download size: 18 KB
- Download link checked 10 Sept 2026 — working
These come from our own check of the pack file, not from the source page.