What is Sudoku?
Sudoku is a number-placement puzzle where each row, column, and 3x3 box must contain the digits 1 to 9 exactly once.
Free online puzzle
Play Sudoku Online
Choose a difficulty and start solving instantly in your browser. The first screen stays focused on the board, while the deeper guides and FAQ live further down the page.
Free online puzzle
Easy Sudoku
A calm starting board with clearer openings and a gentler pace.
Easy Sudoku is ready. Select a cell to start.
Sudoku Solved!
You completed the Sudoku board.
Difficulty: Easy
Sudoku ID: 1001
Time: 00:00
Great solving!
About Sudoku
Sudoku is one of the most approachable logic games because the rules are simple and the challenge comes from observation rather than arithmetic. Every puzzle uses the same classic 9x9 layout, but the path to the solution changes from board to board. That makes Sudoku relaxing for casual sessions and satisfying for longer, more focused play.
On Sudoku-Play.org, the first screen is always the game. You open the page, see the board immediately, and can begin without extra steps. The tools around the puzzle stay compact so the grid remains the center of attention.
How to Play Sudoku
Look at each row, column, and 3x3 box to find which digits are still missing. A number can appear only once in each of those groups, so every move should satisfy all three conditions at once. When more than one digit looks possible, notes help you track candidates without committing too early.
- Start with rows or columns that already contain many fixed numbers.
- Check 3x3 boxes to narrow down where a missing digit can go.
- Use notes for uncertain cells, then clear them as the board opens up.
Sudoku Difficulty Levels
Different players want different pacing, so this first version includes four clear levels. Easy boards help you settle into the rhythm of Sudoku. Medium puzzles ask for more scanning and candidate tracking. Hard and expert levels reduce the number of obvious placements and reward deeper logic.
Easy Sudoku
More starting clues and a welcoming pace for everyday play.
Medium Sudoku
Balanced boards that feel thoughtful without becoming overwhelming.
Hard Sudoku
Fewer givens, tighter logic, and a stronger reason to use notes.
Expert Sudoku
Lean, demanding grids for players who want a serious challenge.
Benefits of Playing Sudoku
Sudoku rewards patience, pattern recognition, and steady concentration. It can be a good mental reset because the rules are clear and the task is self-contained. Many players enjoy the quiet rhythm of checking possibilities, spotting a hidden fit, and gradually turning uncertainty into a complete board.
Because each session is short and structured, Sudoku also fits naturally into breaks during the day. A quick puzzle on mobile can feel productive without becoming stressful or noisy.
Tips for Beginners
If you are new to Sudoku, avoid guessing early. Start with the simplest deductions and let the board reveal more information. The cleaner your process, the easier it becomes to avoid contradictions and notice the next logical move.
- Fill in obvious singles before moving to harder spots.
- Keep notes tidy instead of writing every possible digit everywhere.
- When stuck, switch perspective and scan boxes before rows again.
FAQ
How do you play Sudoku?
You review the numbers already on the board, identify missing digits, and place values only where they fit all Sudoku rules at the same time.
Is this Sudoku free to play?
Yes. The game on Sudoku-Play.org is free to play in your browser with no sign-up wall.
Can I play Sudoku on mobile?
Yes. The layout is designed for phones first, with a large board, generous spacing, and finger-friendly number buttons.
What is the difference between easy and expert Sudoku?
Easy puzzles give you more immediate placements, while expert boards remove more clues and require stronger scanning, notes, and multi-step logic.
Does each puzzle have one solution?
Yes. Each puzzle in this version of Sudoku-Play.org is tied to a single valid solution.