Sudoku – free sudoku online
Fill the grid so that every row, column and 3×3 box contains the digits 1–9 exactly once. A new random puzzle every round – pick a difficulty and get started.
How to play
Sudoku is about filling a grid of 9 × 9 cells so that the digits 1 to 9 appear exactly once in every row, in every column and in every marked 3×3 box. Some digits are already filled in from the start – they are bold and cannot be changed. Click an empty cell and enter a digit with the on-screen keypad or with your keyboard.
If you use the notes mode (the pencil) you can write small helper digits in a cell while you reason your way forward – just like using a pencil in the newspaper. The Check button marks incorrect digits in red so you can correct yourself without spoiling the puzzle. Every puzzle is generated at random and has a complete solution.
A classic beginner tip: look for rows, columns or 3×3 boxes that already have many digits filled in – that is where it is easiest to work out what is missing. On Easy you get more clues from the start, while Hard requires both notes and patience. Your best time per difficulty is saved locally in your browser.
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