Free Classic Sudoku: Play the 9x9 Original

Sudoku69 is a free sudoku game that runs in your browser. The board above is the standard 9x9 grid, so you can play sudoku online free straight away. Below you will find the rules, the six levels and the tools that help when a puzzle stalls.

How to play in 3 rules

Fill every empty cell with a digit from 1 to 9 so that:

1. Each row holds every digit once.
2. Each column holds every digit once.
3. Each 3x3 box holds every digit once.

Every puzzle can be solved by logic alone, so you never need to guess. That makes it a proper sudoku brain game: you reason your way to each digit. A puzzle our rater cannot solve by logic is never published.

Pick your level

There are six levels of sudoku puzzles, and each is rated by the hardest technique a puzzle needs, not by how many digits are given. Start at Easy, rated 1.0 to 1.9, where singles are enough. Medium (2.0 to 2.9) adds pairs, pointing pairs and box line reduction. Hard (3.0 to 4.9) brings fish and wing patterns, Expert (5.0 to 6.9) needs chains and colouring, Master (7.0 to 9.9) uses grouped links and locked sets, and Legendary starts at 10.0.

A good rule of thumb: play the level where you finish most puzzles but still learn something new from about one in three. If you are stuck every time, drop a level. If nothing ever slows you down, go up one. The difficulty levels guide explains the rating in full.

Notes, hints and autosave

When singles run out, switch on notes and pencil the candidates into each cell. If you are still stuck, ask for a hint instead of guessing. Your game saves automatically, so you can close the tab and continue later on desktop or mobile. For a fresh puzzle every day, try the daily Sudoku.

Where to learn

New to the puzzle? Read how to play Sudoku for the rules with examples, then tips for beginners for your first moves on a fresh grid. When you want to learn each pattern in order, the solving techniques ladder runs from singles to chains.