Sudoku Generator

A New Puzzle, Every Time

Difficulty

Click "New Puzzle" to generate a Sudoku.

.sudoku-grid { display: grid; grid-template-columns: repeat(9, minmax(28px, 42px)); grid-template-rows: repeat(9, minmax(28px, 42px)); border: 3px solid var(--bs-body-color); } .sudoku-cell { display: flex; align-items: center; justify-content: center; border: 1px solid var(--bs-border-color); font-weight: 700; font-size: 1.1rem; background-color: var(--bs-body-bg); } .sudoku-cell.given { color: var(--bs-primary); } .sudoku-cell.solution-reveal { color: var(--bs-success); } .sudoku-cell.border-right-thick { border-right: 3px solid var(--bs-body-color); } .sudoku-cell.border-bottom-thick { border-bottom: 3px solid var(--bs-body-color); }

Understanding This Generator

Guaranteed Unique Solution

Every generated puzzle is verified to have exactly one valid solution — cells are only removed from a completed grid when a solver confirms no alternative solution exists.

Difficulty by Clue Count

Easy puzzles keep more starting numbers (clues) visible; Hard puzzles remove more, requiring deeper deduction.

Print-Friendly

Use the Print button for a clean, ink-friendly puzzle grid without the rest of the page.

Local Processing

Every puzzle is generated entirely in your browser — nothing is sent to a server.

Sudoku Rules

Fill the 9×9 grid so that every row, every column, and each of the nine 3×3 boxes contains the digits 1 through 9 exactly once. The blue numbers are your starting clues and can't be changed; work out the rest through logic and elimination.

Key Takeaways

No Guessing Required: A properly constructed Sudoku, like every puzzle here, can always be solved through pure logic.
Stuck? Reveal It: Click "Reveal Solution" any time to see the completed grid.
Client-Side Only: Puzzle generation and solving both happen locally in your browser.

Sudoku Generator - Free Printable Sudoku Puzzles Online