Play Sudoku online
Sudoku is a 9×9 logic puzzle divided into nine 3×3 boxes. The goal is to place the digits 1 through 9 so no digit repeats in a row, column, or box.
This version generates a fresh valid grid for each game and supports Easy, Medium, and Hard boards with a timer, mistake counter, and local best times.
How to control Sudoku
- Select an empty cell, then choose a number from 1 to 9
- Desktop: number keys also enter digits
- Use Erase, Backspace, Delete, or 0 to clear a selected cell
How to play
- 1
Fill every empty square with a digit from 1 to 9.
- 2
Each row, column, and 3×3 box must contain each digit only once.
- 3
Use the highlighted peers and conflicts to reason through the grid.
Tips for a better run
Start with rows, columns, or boxes that already contain many numbers.
When a digit can fit in only one cell inside a row, column, or box, place it before guessing.
Scan the same number across neighboring boxes to eliminate impossible positions.
On harder boards, keep the grid organized and re-check conflicts before making another entry.
Frequently asked questions
Does every game use a new Sudoku board?
Yes. A valid solved grid is shuffled for each new game and cells are removed based on the selected difficulty.
What changes between difficulty levels?
Harder levels remove more starting digits, leaving fewer immediate clues.
Does Sudoku save my best time?
Yes. The best time for each difficulty is stored locally in your browser.
