Play Sudoku — Free
The classic 9×9 logic puzzle. Fill every row, column and 3×3 box with 1–9 — no repeats. Every puzzle has exactly one solution.
Solved! 🎉
What is Sudoku?
Sudoku is the world's most popular logic number puzzle. You're given a 9×9 grid partly filled with digits, and your job is to complete it so that every row, every column and every 3×3 box contains the numbers 1 to 9 exactly once. Despite the numbers, Sudoku takes no arithmetic and no special maths skills — the digits are just symbols, and everything you need is logic, patience and concentration.
The modern puzzle was popularised in Japan, and its name is short for a phrase meaning "the digits must be single." It has since become a daily habit for millions of people. Because solving relies on pure deduction, Sudoku makes an excellent brain game: play a puzzle or two each day and you'll notice sharper focus and quicker pattern-spotting over time. Every puzzle on vygam is generated fresh with a single, guaranteed solution, so you can always reach the answer through reasoning alone — never guesswork.
How to Play
A move is a mistake whenever it repeats a digit inside a unit. Specifically, a placement is incorrect if:
- any row ends up with the same number from 1 to 9 more than once;
- any column ends up with the same number from 1 to 9 more than once;
- any 3×3 box ends up with the same number from 1 to 9 more than once.
Sudoku Tips & Strategy
Sudoku is easy once it clicks, but the first few puzzles can feel intimidating. These beginner-friendly techniques will get you solving faster.
Start where the grid is fullest
Scan for any row, column or 3×3 box that already holds five or more numbers. With so few blanks left, the missing digits are the most constrained — often only one number can legally fit a cell once you account for everything already in its row, column and box.
Hunt for the missing third
Split the board into three bands of three boxes. When two boxes in a band already contain the same digit, the third box must hold it too. Cross-reference the rows and columns those digits occupy and you can usually pin the number to a single empty cell.
Use pencil notes for candidates
When a cell could take more than one value, switch on Notes and jot down every candidate. As you fill neighbouring cells, candidates get eliminated — and a cell left with just one note is a guaranteed answer.
Never guess
Every vygam puzzle has exactly one solution reachable by logic, so if you're tempted to guess, there's a deduction you haven't spotted yet. Step back, rescan the tightest unit, and the forced move will appear.
FAQ
Is Sudoku free to play?
Yes — Sudoku on vygam is completely free. There is no download and no sign-up; it plays instantly in your browser.
How do you play Sudoku?
Fill the 9×9 grid so that every row, every column and every 3×3 box contains the digits 1 to 9 with no repeats. Each puzzle has exactly one solution.
How do I get better at Sudoku?
Scan for rows, columns or boxes that are nearly full and place the forced digits first. Use pencil notes to track candidates, and look for cells where only one number can possibly go.
Does Sudoku require math?
No. The digits 1 to 9 are only symbols — there's no adding or calculation of any kind. Sudoku is a pure logic puzzle that rewards concentration and pattern recognition, not maths skill.
Is Sudoku good for your brain?
Sudoku is a popular brain game because it exercises logical reasoning, working memory and focus. Playing a puzzle daily can help sharpen concentration and pattern-spotting over time.