Illegal Building
by Mrbysco
Illegal Building adds a small set of cursed blocks to Minecraft, such as half-block-offset cobblestone and sand that falls upside-down.
What it does
Illegal Building adds cursed blocks and behaviours to the game. Examples include cobblestone sitting half a block out of place, and sand that falls upward instead of down. Cactus and sugarcane also grow in the opposite direction. The content is meant for novelty builds and joke worlds rather than standard survival progression. Files are published for Forge and NeoForge across 21 release versions, 1.16.5 – 26.2. Client and server both need the mod, so every player on a server that runs it must install it too. The code is open source under the MIT License.
Key features
Offset cobblestone
A cobblestone variant sits half a block out of line with the blocks around it, giving builds an unusual look.
Upside-down sand
Sand falls upward rather than downward, so placed sand behaves in a way vanilla blocks do not.
Inverted plant growth
Cactus and sugarcane grow downward from their base, adding a cursed growth pattern to farms.
Gallery
Compatibility
Latest build for each game version and loader.
26.x2 of 2 versions with builds
1.21.x6 of 6 versions with builds
1.20.x5 of 5 versions with builds
1.19.x3 of 3 versions with builds
1.18.x3 of 3 versions with builds
1.17.x1 of 1 version with builds
1.16.x1 of 1 version with builds
Only full game releases are shown. This mod publishes no snapshot builds.
In the catalog
Illegal Building is one of 7,555 Cursed mods on ModsFinder, and one of 3,426 Cursed mods for Forge. 13,894 mods support Minecraft 26.2.
More from Mrbysco
Similar mods
What the author says
Like cobblestone that's offset be half a block. Sand that falls upside-down. Cactus / Sugarcane that grows upside-down.
Official listing
- Modrinth page
- modrinth.com/mod/illegal-building
- Owner
- Mrbysco
- Published
- 2022-05-24
- Updated on Modrinth
- 2026-08-12
- Facts verified
- 2026-10-15