Double U (Now with Vertical Slabs)
Double U, the NeoForge mod by CaylusDoesFun, adds vertical slabs along with a mix of ores, tools, blocks and some darker content.
What it does
Double U is a NeoForge mod that adds vertical slabs, a block shape that fills one half of a block's width. Beyond slabs it adds ores, tools and blocks, and the author describes it as a mix of useful, funny and potentially frightening content meant to make Minecraft less dull. The author notes a few days of play were needed to reach everything the mod contains.
The mod sits in the Cursed category, with secondary tags for adventure, game mechanics, decoration, technology and world generation. Players who avoid frightening material should check the item list before installing, since the author text names demonic items among the additions. Installation needs only NeoForge. Files cover 1.21.8 and 26.1.2, and the environment is client and server, so both the server and every player must run it. Double U is not open source and is released under All rights reserved.
Key features
Vertical slab blocks
Slabs that occupy a vertical half of a block, adding a placement option that vanilla slabs do not offer.
Added ores and tools
New ores and tools extend the progression, with items that the author describes as useful and sometimes unsettling.
Decorative blocks
A set of blocks suited to building and decoration, alongside the functional additions.
Optional darker content
Some additions lean toward horror themes, including demonic items such as a crucifix, demon resin and demonic netherrack.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Building with vertical slabs
Builders can use vertical slabs to create walls and trim that sit flush against a face of a block instead of the top or bottom.
Survival progression
Players who want the early game to feel less repetitive can work through the new ores and tools.
Who it’s for: Players who enjoy a mix of practical additions and spooky themes, and builders who want vertical slab shapes. Players who dislike frightening content should look over the items before adding the mod to a world.
How it compares
R's Vertical Slab and [RVS] Rusty's Vertical Slabs both focus on vertical slab blocks alone. R's Vertical Slab is published for NeoForge on 1.21.4 – 1.21.8, under All rights reserved and not open source. [RVS] Rusty's Vertical Slabs is also NeoForge, for 1.21.1 – 1.21.8, under the MIT License. More Minecraft is open source under the MIT License and covers 1.20.6 – 1.21.4, so it is a broader option on an older range.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Double U (Now with Vertical Slabs) | NeoForge | 1.21.8 – 26.1.2 | Client and server | 2026-09-27 |
| R's Vertical Slab | NeoForge | 1.21.4 – 1.21.8 | Client and server | 2025-08-26 |
| [RVS] Rusty's Vertical Slabs | NeoForge | 1.21.1 – 1.21.8 | Client and server | 2026-08-27 |
| More Minecraft | NeoForge | 1.20.6 – 1.21.4 | Client and server | 2025-03-06 |
Questions
Does Double U need NeoForge?
Does the server need Double U too?
Which game versions are covered?
In the catalog
Double U (Now with Vertical Slabs) is one of 7,555 Cursed mods on ModsFinder, and one of 2,801 Cursed mods for NeoForge. 15,189 mods support Minecraft 26.1.2.
Similar mods
What the author says
Cool minecraft mod that adds in stuff that's Cool, Useful, Funny, or even potentially, Scary. AND VERTICAL SLABS This mod is cool and adds stuff to minecraft that can make it less boring. Sometimes minecraft is hard and boring but this mod can make it easier and less boring but adds in adventure and some scary…
Official listing
- Modrinth page
- modrinth.com/mod/double-u
- Owner
- CaylusDoesFun
- Published
- 2026-01-14
- Updated on Modrinth
- 2026-09-27
- Facts verified
- 2026-10-15