What is Sudoku?

Sudoku is a logical puzzle game, originally created in puzzle books and then made available in countless newspapers worldwide. We explain what makes a Sudoku and why solving them is good for you.

How to start

Sudoku may seem difficult at first glance, but actually it is not as hard as it looks! The aim is to fill in the whole grid – and depending on the difficulty of the puzzle this can be quite easy (just counting and checking), or later on for more tricky puzzles require a bit more logic and reasoning. We explain how to complete your first Sudoku puzzle.

Techniques

Learn how to go from simple, easy to learn deduction techniques such as Single Position and Single Candidate through to the mind-bending Swordfish and Nishio techniques. And how, if all else fails, you can guess!

Daily Sudoku puzzles

You can find six brand-new puzzles here every day, ranging from beginner through to diabolical puzzles that require the most advanced techniques. Here’s one of today’s puzzles:

Get the app

For the best Sudoku playing experience, download our free* Sudoku of the Day app! You’ll get easy access to all six daily puzzles, a range of easy to use tools such as pencilmarks and smart hints, plus you can upgrade to access the puzzle generator and puzzle solver.

Speedier Site – faster downloads!

We’ve been working behind the scenes to improve how the pictures work here! Some of the pages on the site (for instance the technique pages) have multiple Sudoku images showing, as they explain how to apply a technique. Some pages (for instance one of the Step-By-Step guides for one of the daily puzzles) can have […]

* Astraware Sudoku for Nook is a premium product which includes all the optional functionality for a single purchase price.