SudokuAcross every row
Fill each horizontal row with the digits 1 through 9. Each digit appears exactly once.
A LITTLE CHALLENGE. A CLEARER MIND.
Play Sudoku. Think Sharper.
Free Sudoku puzzles from Easy to Expert, each with one unique solution. Pick a level and find your flow.
YOUR DAILY DOSE OF FOCUS
Make your next move.
A moment to pause.
Your puzzle will be right here.
Puzzle progress0%
1–9 to fill · Shift+1–9 for notes · Arrows to move · Delete to erase
◇ No account needed✓ Always free to play◎ Made for your focus
SIMPLE RULES. ENDLESS POSSIBILITIES.
Nine numbers. One satisfying solve.
No math required. Just a little logic
and one good move at a time.
Down every column
The same rule goes vertically: every column needs all nine digits, with no repeats.
Inside every box
Each outlined 3×3 box also contains 1 through 9. Use all three rules together to find a fit.
Start with what you know. Look for a row, column, or box with just a few empty cells. A small opening can unlock the whole puzzle.
BUILD YOUR SOLVING INSTINCT
All strategy guides ↗A few ways to see the next move.
Scan and Crosshatch
Pick a digit and scan the rows and columns where it already appears. In each box, those lines rule out places it cannot go.
Read the guide →Naked Singles
Check an empty cell against its row, column, and box. If only one digit is possible, you have your next move.
Read the guide →Hidden Singles
A digit may fit in only one cell of a row, column, or box, even when that cell has other candidates. Look for the digit's only home.
Read the guide →Candidate Notes
Turn on Notes to mark possible digits. When you place a number, review nearby notes and remove candidates that no longer fit.
Read the guide →Row-Column Interaction
If all possible spots for a digit inside a box lie in one row, that digit cannot appear elsewhere in that row outside the box. The same works for columns.
Read the guide →Put a little logic
into practice.
Your next puzzle is ready.
KEEP PLAYING
More free Sudoku puzzles
Daily SudokuOne shared puzzle a day.Easy Sudoku43 clues, perfect to start.Medium Sudoku36 clues, room to think.Hard Sudoku30 clues, notes recommended.Expert SudokuAbout 25 clues, beyond singles.6×6 SudokuDigits 1 to 6, great for kids.Killer SudokuCages, sums, and pure logic.Sudoku SolverSolve any puzzle, step by step.Printable SudokuPrint or save as PDF.Sudoku StrategiesLearn every solving technique.
GOOD TO KNOWA little clarity
A little clarity
before you play.
The details, without the distractions.
Is Sudoku Prime free?
Yes. Every level, the Daily Sudoku, notes, hints, and statistics are free. No account or subscription is required.
Can I play on mobile?
Yes. Tap a cell and use the number pad right below the grid. The layout adapts to phones, tablets, and desktops.
How are difficulty levels different?
Easy starts with 43 clues and Medium with 36; both can be solved with simple singles. Hard starts with 30 clues. Expert starts with about 25 clues and always needs a technique beyond singles. Every puzzle has exactly one solution.
Does the game save my progress?
Yes, when browser storage is available. Each difficulty and the Daily Sudoku keep their own saved game in this browser, so switching levels never erases your progress.
Are hints unlimited?
Yes. Each hint fills one cell with the correct digit and adds to your hint count. Hints never reveal the entire solution at once.
Is there a Daily Sudoku?
Yes. The Daily Sudoku is one puzzle per day, the same for every player, with a daily streak. Difficulty grows from Easy on Monday to Expert on Sunday.
Does Sudoku help with memory?
Sudoku is an enjoyable way to practice logic, attention, and working with patterns. Benefits vary, and playing is not a medical treatment or a guarantee of improved memory.