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Sudoku generator

Getting ready…

Sudoku generator User guide

Create a uniquely solvable puzzle, play it and print the solution.

Instructions

  1. Choose easy, medium or hard and create a new puzzle.
  2. Fill blank cells with 1–9. Check validates current entries; Show solution reveals the complete answer.
  3. Save PNG or JSON, or use Print/PDF. Enabling the solution view includes the answer when printing.

Example

Input / settings

Choose a difficulty

Result / checks

Puzzle with exactly one solution

Generated puzzles are checked for exactly one solution. Difficulty is based on blank count rather than a guaranteed human-solving technique grade.

Please note

Settings → PNG / Print / JSON

  • Generated puzzles are checked for exactly one solution. Difficulty is based on blank count rather than a guaranteed human-solving technique grade.
  • Given numbers cannot be edited. PNG saves the current puzzle/solution view; JSON includes both puzzle and answer data.
  • Files and entered content are processed in this browser. Save results before closing the page.