dupe_hack (April Fools)
by OctoberFEST
dupe_hack is an April Fools NeoForge mod whose Voting Update adds two item-duplication methods, one unstable and one permanent, gated by chest-based mob kills.
What it does
The mod adds the minecraft:dupe_hack April Fools Voting Update, with a set of changes to how items are copied. Duplication is tied to chests: a mob that holds a chest in its main hand may drop an extra copy of an item, and the drop chance depends on which chest it carries. Wooden chests give 5%, copper chests 6% plus 2% for each oxidation stage up to a maximum of 12%, and ender chests 25%.
Two new items handle duplication directly. The Unstable Dupe Hack and the Dupe Hack work the same way on paper, but the unstable one is removed after a single use. Right-clicking with either one in the main hand attempts a copy of the item placed in the offhand, and the offhand item is consumed in the process, so the copy comes out as two dropped items. The unstable version can also attempt to duplicate a Dragon Egg.
The mod runs on client and server and is published for NeoForge only. Its files cover 1.21.1 and 26.1.2, with 1.0.0 for 26.1.2 as the latest, released on 2026-07-17. It is not open source and is released under All rights reserved.
Key features
Chest-based mob drops
Mobs holding a chest in their main hand can drop extra items, with the chance set by the chest type.
Oxidizing copper chests
A copper chest's drop chance rises by 2% per oxidation stage, capped at 12%.
Unstable Dupe Hack
A single-use item that copies the offhand item and breaks after use.
Dupe Hack
A reusable item that copies the offhand item when used with the main hand.
Dragon Egg attempt
The unstable item can attempt to duplicate a Dragon Egg.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Players and server owners who want the April Fools duplication items and chest-based drops for a single seasonal event. The mod needs to be installed on both the client and the server.
Questions
Does dupe_hack need to be installed on the server?
Which loader does dupe_hack support?
Why does the unstable Dupe Hack break?
In the catalog
dupe_hack (April Fools) is one of 7,216 Magic mods on ModsFinder, and one of 2,992 Magic mods for NeoForge. 15,189 mods support Minecraft 26.1.2.
Similar mods
What the author says
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…
Official listing
- Modrinth page
- modrinth.com/mod/dupe_hack
- Owner
- OctoberFEST
- Published
- 2026-07-17
- Updated on Modrinth
- 2026-07-17
- Facts verified
- 2026-10-15