Random Blocks

Make a world and nothing is what it looks like.

Stone might be pink wool. Dirt might be a bookshelf. The whole world generates out of the wrong materials, and you have to survive it.

The end portal is left alone, so the End is still reachable.

For Minecraft 26.2 (Fabric).

Installing

1. Install Fabric Loader for Minecraft 26.2.
2. Put randomblocks-1.0.0.jar and Fabric API in your mods folder:
   • Windows: %appdata%\.minecraft\mods
   • macOS: ~/Library/Application Support/minecraft/mods
   • Linux: ~/.minecraft/mods
3. Make a new world. The mod only changes land as it is generated, so an existing world will only scramble in places you have never been.

Only the machine generating the world needs the mod. On a server, that is the server. Players can connect with a completely vanilla client and see the scrambled world normally.

What it actually does

Every kind of block is swapped for a different kind, and the swap is the same everywhere. If stone came out as pink wool, then all stone in that world is pink wool, in every chunk, forever. The world reads as a strange but coherent place rather than as static.

The swap is decided by your world seed. The same seed always scrambles the same way, and land you generate a month from now still matches the land around your spawn.

Only generation is affected. A block you place is the block you placed. Mining gives you the drop of whatever is actually there — break the pink wool that used to be stone and you get pink wool, not cobblestone.

What a block can turn into

Anything that is a plain, breakable, full cube: wool, concrete, terracotta, planks, glass, ores, glowstone, TNT, sponge, and a few hundred others.

Nothing that would float, need something to stand on, or refuse to break. No barriers, no command blocks, no bedrock, and nothing slower to mine than obsidian — a world you cannot dig through is not a challenge, it is a screensaver.

What is left alone

Can you still beat the game?

Yes, and that is deliberate. Full randomisation quietly bricks a run: if nothing in your world happens to generate as iron ore or as a log, there is no pickaxe and no crafting table, and the End is unreachable no matter how intact the portal is.

So three things are handled more carefully.

Ores swap only with other ores. Coal, iron, copper, gold, redstone, lapis, emerald, diamond, nether gold, nether quartz, gilded blackstone and ancient debris are shuffled among themselves. All of them still generate, none of them are where you expect. Your first iron vein might be diamonds, and it might be the last coal you see for a while.

Logs swap only with other logs. Every wood type still grows somewhere, so there is always a crafting table.

Andesite becomes cobblestone and diorite becomes gravel. Both generate in fat blobs all over the overworld and are needed for nothing, so they are cheap to spend on a guaranteed stone pickaxe and a guaranteed piece of flint.

Everything else is fair game.

If you want it genuinely brutal, turn keepProgressionFair off in the settings. Ores and logs go into the general pool with everything else, and the world may well be unbeatable. That is the point of the setting.

Finding out what became what

Operators can ask:

/randomblocks lookup minecraft:diamond_ore
> Diamond Ore generates as Lapis Lazuli Ore.
> Deepslate Emerald Ore generates as Diamond Ore.

It answers both directions at once: what that block turned into, and what turned into it. The second line is usually the one you want — that is where to go digging.

/randomblocks on its own shows the seed and how many blocks were replaced. Anyone can run it.

Settings

A file appears at config/randomblocks.json the first time you run the mod.

The shuffle is decided when a world first loads, so changes only affect land generated afterwards. Edit it halfway through a world and you get a visible seam where the old chunks meet the new ones.

The end portal blocks are protected no matter what any of these say.

Things worth knowing

• Start a new world. Existing chunks are never rewritten.
• Grass may not be grass, which means animals may not spawn where you expect. Hostile mobs are unaffected, so rotten flesh is a reliable early food source. Village chests help a lot.
• Trees, flowers and grass become solid cubes. Anything that was not a full block turns into one, so forests look like blobs and the ground is smoother than usual.
• Sand and gravel still fall. If the world generated with something heavy where stone used to be, digging into a hillside can be exciting.
• Everyone connecting to the same world sees the same thing. The scramble is baked into the saved chunks, not applied per player.
• Two people with the same seed get the same world, so it is a fair race.

Version 1.0.0. Built for Minecraft 26.2 with Fabric Loader 0.19.5 and Fabric API 0.159.0+26.2.