Minecraft

Minecraft is a popular sandbox game where players can explore and build in a procedurally generated world. The world is generated based on a seed, which is a number that determines the layout of the terrain, biomes, and structures. By analyzing certain features of the world, such as the bedrock pattern, it is possible to reverse-engineer the seed and even determine the player’s coordinates.

Tools

• Seed cracking

From a live minecraft instance, you can use the SeedcrackerX tool to recover the world seed from in-game information. It is a Fabric mod that can be installed on the client side.

• Seed mapping

Once the seed is known, you can use it to find coordinates of interest, such as specific biomes or structures. The following tools can help with that:

• Bedrock pattern cracking

The topmost bedrock layer at the bottom of the world (y = 5) is a per-column pseudo-random mix of bedrock and stone, fully determined by the seed and the (x, z) coordinates. A screenshot showing enough of that layer can be brute-forced back to a unique (x, z), and sometimes to the seed itself.

The generation algorithm changed in 1.13 (the world-generation rewrite), so the cracking tool must match the world version:

• pre-1.13 worlds use the old position-seeded random,
• 1.13 and later use the newer scheme.

Using a tool built for the wrong version returns wrong coordinates, so always check the world version first.