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Sudoku Solver and Uniqueness Check

Online sudoku solver and uniqueness check. A node-limit result reports unknown uniqueness rather than asserting a unique solution.

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A useful toolkit for text, data, images and calculations.

  1. 01

    Add your input

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  2. 02

    Make it yours

    Adjust the options and run the action.

  3. 03

    Take the result

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sudoku and uniqueness check online

Use sudoku solver and uniqueness check online for Puzzle input — follow the example. A node-limit result reports unknown uniqueness rather than asserting a unique solution. Bounded local puzzle processing. Search limits and supported input formats are described for each tool.

How to use it

Select Try example and follow its grid, word-list or JSON shape. Change the options if needed, select Run tool, then copy or download the JSON result.

Options and example settings

OptionChoices / valueExample default
Puzzle input — follow the exampleUse the grid, word list or JSON shape in the worked example.530070000 600195000 098000060 800060003 400803001 700020006 060000280 000419005 000080079

Calculation method

Minimum-remaining-values backtracking; stop after two solutions or 100000 visited nodes.

Worked examples

Apply sudoku solver and uniqueness check to the case below, keeping the displayed units and assumptions. A node-limit result reports unknown uniqueness rather than asserting a unique solution.

Sudoku Solver and Uniqueness Check — worked case

Settings: No additional options

Input:

530070000
600195000
098000060
800060003
400803001
700020006
060000280
000419005
000080079

Calculated result for these inputs:

Output:

{
  "solutions": [
    "534678912672195348198342567859761423426853791713924856961537284287419635345286179"
  ],
  "nodes": 52,
  "limitReached": false,
  "unique": true,
  "solution_rows": [
    "534678912",
    "672195348",
    "198342567",
    "859761423",
    "426853791",
    "713924856",
    "961537284",
    "287419635",
    "345286179"
  ]
}

Choose the right tool

Choose a checker to validate a supplied grid and a solver to search for answers. Generators use reproducible seeds. Read uniqueness, unplaced-word and truncation flags before treating an output as complete.

Limitations and common mistakes

  • A node-limit result reports unknown uniqueness rather than asserting a unique solution. Bounded local puzzle processing. Search limits and supported input formats are described for each tool.
  • Use the exact symbols, row sizes and JSON keys shown in the worked example. Check any limit or incomplete-result flags.

Frequently asked questions

How can I use sudoku and uniqueness check online?

Select Try example and follow its grid, word-list or JSON shape. Change the options if needed, select Run tool, then copy or download the JSON result.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.

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