Welcome to Sudoku Exchange

This video intro will take you through the features of the site and includes a demonstration of solving a Sudoku puzzle using the site’s web app:

What’s this site about?

This site provides an excellent web app that you can use to solve Sudoku puzzles and which contains absolutely no ads. A selection of puzzles of varying difficulty is provided from our puzzle bank and updated each hour; or you can bring your own puzzles and solve them in our app.

Most importantly, you can use this site to share Sudoku puzzles. Whether you select one of our puzzles or enter one of your own, you can share a link to that puzzle so your friends and family can enjoy it too (and perhaps compete to beat your time).

This site can also provide hints if you get stuck. Each hint will explain the logic behind why it's a logical next move. And don't worry, you can get as many hints as you need.

Our app has a number of customisable features, including:

• You can choose between light or dark mode.
• There's a timer for those who like to race the clock, but you can turn it off if you don't want the distraction.
• You can choose between regular "simple" pencil marking, and a dual pencil marking system that you could use for Snyder notation (non-affiliated link).
• Convenience features for highlighting matching digits and filling-in or cleaning-up pencilmarks.
• Your progress on any puzzle is saved so that you can close the puzzle and return to it later - or you can turn that off if you prefer.

If you have concerns over how we store your preferences and how your puzzle progress is saved, please refer to our privacy policy.

Loading puzzles via bookmarklets

If you're solving a puzzle on another site and are missing the features of this site’s web app, you might like to open the same puzzle here. The bookmarklets page explains how.

Is that all?

That’s all for now. There are all sorts of things that may be added over time, but it’s a hobby project so don’t hold your breath. To put that another way, if you like how it is now you can be confident it’s not going to change too much.