I published a book called Tough Sudoku Volume 1 in June 2022.
It contains 400 puzzles.
They are printed on A4 size paper and each puzzle is 11 centimetres square.
The book is available on Amazon. You can preview and/or purchase it using the Buy my book on Amazon link which appears on every page of this blog.
You will see a picture like this:
Click on the Read sample box and you will see the first 18 puzzles. The Copyrighted Material message at the top and bottom of each page was put there by Amazon to stop you plagiarizing the content. It does not appear in the paperback version.
All the puzzles in the book have a similar level of difficulty so if you can solve the first few, you will be OK with the rest of them.
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