Published data sample

Four published Sudoku puzzles in JSON and CSV.

This fixed sample contains the four difficulty levels published on 17 July 2026, with unique solutions, engine facts, recomputable LDI components, source links, a schema, and byte-level checksums.

Reuse licence: CC BY 4.0

The published JSON, CSV, schema, manifest, report, and licence notice are available under Creative Commons Attribution 4.0 International. You may share and adapt them, including commercially, with attribution and a note of changes. The Legen brand, website code, private corpus, generators, seeds, proofs, commitments, unpublished data, and third-party material are excluded.

cc-by-4.0

Creative Commons Attribution 4.0 International · LICENSE.md

Sample identity

datasetVersion: legen-sudoku-published-sample/2026-07-17/v1
sampleDate: 2026-07-17
records: 4
Creator: Ryan Carter

Versioned downloads

File	Media type	Bytes	SHA-256
puzzles-2026-07-17.json	`application/json`	4492	`3eda1fb2f65e9b7fbc8b3d8802e27420d1abe488c7df8bea87a4804e1913603e`
puzzles-2026-07-17.csv	`text/csv`	2374	`9d9ca4a554887a66f549408bf6ba541e102f85c337f4c1bbeb191e1955115e86`
schema.json	`application/json`	4519	`4e050081aaa5aa7e952b5be51f84d55006047cf270bc50959b2472af532fc655`
2026-07.json	`application/json`	4157	`eb0b112b597d7388bb9d61b69dd802fbc697b730a9a804d229abc1add4b019cf`
LICENSE.md	`text/markdown`	785	`68b9085513f06da1302a42ba00a1bdab2abc58542aa64468ad338873770549ec`

manifest.json

Four included Puzzle IDs

Puzzle ID	Tier	LDI	Raw T / S / E	Steps	Hardest technique
`LDI0-01d0d48d9f38d1d983516ff987e526dd31d6e340`	Easy	0	`1 / 0 / 0`	50	Naked Single
`LDI0-063aa5ab9beb1ceb7bcd68ea19dbbd9bc7f21e62`	Medium	20	`2 / 14 / 0`	53	Hidden Single
`LDI0-06f160d8685b6dd8c174b53edaf45b979b41529e`	Hard	23	`2 / 17 / 0`	56	Hidden Single
`LDI0-07c296b8e4ff384332ad2017fd093e174b9e9ea3`	Expert	75	`5 / 32 / 16`	65	Hidden Pair

Field contract

Each row carries givens, solution, date, tier, clue count, unique-solution status, complete logic status, step count, hardest technique, raw and normalized LDI components, engine/LDI versions, and canonical provenance. Full proof traces, seeds, private commitments, and player data are excluded.

Read how the fields are generated and verified

Published-catalogue report

The July report is a separate aggregate of 60 catalogue records from 17–31 July. It is not computed from this four-row sample and contains no player behaviour data.

Read the July 2026 published-catalogue report

Embed one published daily puzzle

The v1 iframe uses one fixed published puzzle, no tracking, no parent script, no postMessage, and a normal attribution link.

<div style="aspect-ratio: 4 / 5; max-width: 560px;">
  <iframe src="https://sudoku.legen.uk/embed/daily-sudoku" title="Embed one published daily puzzle"
    loading="lazy" sandbox="allow-scripts allow-popups"
    style="border:0;width:100%;height:100%;"></iframe>
</div>
<p><a href="https://sudoku.legen.uk/daily-sudoku">Play</a></p>

Embed one published daily puzzle