Free Online Sudoku

Sudoku is a logic-based number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid contain all of the digits from 1 to 9.

Sudoku Rules

• Each row must contain the numbers 1-9, without repetition
• Each column must contain the numbers 1-9, without repetition
• Each 3×3 box must contain the numbers 1-9, without repetition

Sudoku Solving Tips

• Tip 1: Focus on 3×3 boxes that already contain 5+ numbers; use row/column eliminations to lock a single position.
• Tip 2: Treat the grid as 3 big rows and 3 big columns; if a digit appears in two boxes of the same band/stack, the third box must contain it—scan its 9 cells.

Why Play Sudoku

Playing Sudoku daily can help improve your concentration and overall brain power. It's an excellent way to relax while keeping your mind sharp. Our free online Sudoku game offers four difficulty levels, making it perfect for both beginners and experts.

Features

• Four difficulty levels: Easy, Medium, Hard, and Expert
• Error checking with visual feedback
• Notes/pencil mode for advanced solving
• Undo functionality
• Timer to track your solving speed
• Responsive design for mobile and desktop
• Unlimited puzzles generated algorithmically