The Seed It Took a Supercomputer to Find

Summary

For a decade, Minecraft’s tiny menu image, pack.png, showed a waterfall, cliff, and pig, but nobody knew which world it came from. In 2020, a community search set out to identify its seed. A Minecraft seed determines how a world is generated. Although seeds are 64-bit numbers, Java’s random-number generator meant that in the version used for the image, only 48 bits affected the terrain—still 281 trillion possibilities.

How the search unfolded

• Establishing clues: The file’s date and the biomes in the picture pointed to a development version of Alpha 1.2.2. Notch and Dinnerbone couldn’t recall the image or provide its world.
• Reading the picture: Volunteers used the direction of streaks in the water to infer the image’s orientation. By matching the clouds to Minecraft’s repeating cloud texture, they determined which way the camera faced and pinned down the waterfall’s Z coordinate at -31. Cloud drift offered an estimate for X, but the exact position depended on how long the world had been open.
• A parallel breakthrough: The team first solved the better-documented title-screen panorama using Minecraft@Home’s distributed computing approach. Volunteers’ idle computers tested seeds against a reconstructed version of the scene. The successful search showed the method could work at scale.
• Pinpointing the camera and location: By repeatedly aligning simulated screenshots with the image, researchers worked out the camera’s position and angle. They then used a distinctive dirt layer and the beach’s sand-and-dirt pattern to identify the waterfall’s X coordinate: 116. Together with the cloud clue, this placed the scene at X=116, Z=-31.
• Finding the seed: An initial approach using the waterfall and nearby trees proved unreliable because trees might fail to grow on steep terrain. The team instead tested the beach pattern, which could be calculated directly from candidate seeds. About 3,700 volunteers reduced the possibilities from 281 trillion to fewer than 700,000 in three days. A final check of the biome and four adjacent terrain heights identified the seed.

The result

The discovered seed is 3257840388504953787. In Alpha 1.2.2, standing around X=49, Z=0 and looking toward the waterfall recreates the scene.

The pig does not reappear: animals in that version were not determined by the seed, so the pig was simply passing by when the original screenshot was taken.

The hunt took eight months and demonstrated how a small visual clue, careful reverse engineering, and distributed computing could solve a seemingly impossible search.

People and sources featured

• SalC1, whose video prompted the search
• Notch and Dinnerbone, who were asked about the image
• G Smack and Break and two (as rendered in the subtitles), who noticed the water-direction clue
• Tom Warker (as rendered in the subtitles), who began analyzing the title-screen panorama
• Minecraft@Home and its volunteer computing community
• Niraami and Zombie67, whose computers returned the successful seed candidate