A fully used number becomes inactive
Sudoku is one of the most popular logic puzzles in the world. The goal is to fill a 9×9 grid with digits from 1 to 9 so that each row, column and 3×3 box contains every digit exactly once. This free online version offers an endless supply of unique puzzles with no sign-up and no ads.
Easy is perfect for beginners. Many digits are already filled in, and the solution follows from simple logic. Medium requires attention and basic techniques. Hard is for experienced players; you’ll need advanced strategies. Expert is a real challenge even for Sudoku masters.
Playing Sudoku regularly trains logical thinking and improves focus and memory. Studies show that solving puzzles helps keep the brain’s cognitive functions sharp at any age. It’s a great way to spend time well: on your commute, during a break, or before bed.
Fill the 9×9 grid with digits from 1 to 9 so that each row, column and 3×3 box contains every digit exactly once. Tap an empty cell, choose a number, and follow the logic.
Yes, the game is completely free and requires no sign-up. Just open the site and start playing.
There are 4 levels: Easy (for beginners), Medium, Hard and Expert (for experienced players). Every puzzle is generated randomly and has a unique solution.
Yes, the site is fully adapted for mobile devices. Convenient touch controls, a responsive grid and dark theme support.
Yes, your progress is saved automatically in your browser. You can close the tab and come back later, and the game will continue from the same spot.
Puzzles are generated randomly, so the number is practically endless. You’ll never see the same puzzle twice.
Fill the 9×9 grid with digits from 1 to 9 so that each row, each column and each 3×3 box contains every digit exactly once.
Tap any empty cell on the board. It will be highlighted, and the related row, column and box will be emphasized.
Press one of the 1–9 buttons at the bottom of the screen (or a key on your keyboard). The number appears in the selected cell.
A wrong number is highlighted in red. You have 3 tries: after the third mistake the game ends.
Undoes your last action. Hotkey: Ctrl+Z
Removes the number or notes from the selected cell. Key: Backspace
Turns on notes mode: small candidate digits inside a cell. Handy for tough puzzles. Key: N
Automatically fills one cell with the correct number. 3 hints per game total.