Sudoku
Play Sudoku online free. The classic number puzzle game with four difficulty levels, a built-in timer, and pencil mark support. Fill the 9x9 grid with logic.
A 9x9 grid, 81 cells, and numbers 1 through 9 - Sudoku is pure logic with no fluff.
About Sudoku
Sudoku is a classic number puzzle where you fill a 9x9 grid so every row, column, and 3x3 box contains each number 1-9 exactly once. It’s a Puzzle game that requires logical deduction rather than guessing.
Multiple difficulty levels range from easy to expert. The built-in timer tracks your solve time so you can measure improvement.
How to Play Sudoku
Choose a difficulty - easy, medium, hard, or expert. Beginner grids come with more given numbers; expert puzzles leave most of the grid blank. Every puzzle is solvable with logic.
Click an empty cell and enter a number from 1-9. The game won’t let you place a number that conflicts with existing entries in the same row, column, or 3x3 box. Use the pencil tool to mark candidate numbers in cells before committing. The counter shows how many of each number remain, helping you spot placement opportunities.
Start with numbers that have the most given clues and work from there. As you fill cells, the remaining possibilities narrow. Race against your own best times to push your solving speed.
Tips for Sudoku
Start with the most constrained areas Rows, columns, or boxes with the most filled numbers give you the strongest starting point.
Use pencil marks for candidates Note possible numbers in each empty cell before filling. It prevents mistakes.
Work in passes First pass fills obvious placements. Second pass uses elimination. Third pass uses advanced logic.
Game Controls
- Mouse - Click a cell, then click a number to place it
FAQ
What are the difficulty levels in Sudoku?
Easy, medium, hard, and expert. More given numbers means easier puzzles.
Can you make mistakes in Sudoku?
The game prevents invalid placements. You can only place numbers that follow the rules.
Does Sudoku have a timer?
Yes. The built-in timer tracks your solve time so you can compete against your personal records.
Is Sudoku free to play online?
Yes. Sudoku is available to play free in your browser with no download needed.
