Sudoku - Free Online Web Sudoku
A classic logic puzzle game with keyboard and touch support. Start playing instantly in your browser.
Sudoku Overview
Sudoku is a classic logic puzzle game. Fill numbers from 1 to 9 into the grid so that no number repeats in any row, column, or 3×3 sub-grid.
It is easy to learn and great for brain training. Choose your level and challenge yourself with faster and cleaner solves.
How Sudoku Works
Follow these basic rules:
- A Sudoku board contains 9 sub-grids (3×3), with 81 total cells.
- Each cell must contain a number from 1 to 9.
- Numbers cannot repeat within the same 3×3 sub-grid.
- Numbers cannot repeat within the same row.
- Numbers cannot repeat within the same column.
Use these constraints to fill all empty cells correctly.
A valid puzzle has a unique solution, so use existing numbers as clues and infer step by step.
We provide beginner-friendly difficulty options so you can learn first and then level up at your own pace.
Web Sudoku Controls
Number and Note Input
There are two rows of number buttons below the board:
- Select an empty cell, then click a number from the first row of buttons to fill it.
- Use the second row of buttons to add notes (candidate numbers).
Assist Tools and Stats
You can also use these helper actions:
- Use Erase to clear the selected cell.
- Use Hint to reveal the answer for the selected empty cell. Hint usage won’t count as a perfect clear.
- Use Complete For Me to auto-fill all empty cells. Auto-completed games are excluded from game stats.
Your stats are recorded by difficulty, including shortest time, solved puzzles, and perfect solutions.