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Creating world's most difficult puzzles is challenging work. There is also need for large computing capacity after developing effective algorithms. If you want to support this work or you feel that this website is useful or interesting, you can make a donation for the project. Reciprocally you will get puzzles and guides in the pdf format. The amount of donation can be some euros/dollars/pounds or for example one unit per every hour you will use solving these puzzles. You can decide the amount of donation by yourself depending on your conscience, property and sudoku enthusiasm.

You can make your donations via PayPal to the email:

or without middleman directly to my bank account:

IBAN: FI93 5721 1520 1502 31


The puzzles may be used only for private or research purposes. They may not be published in any media without a written permission. If you want to publish puzzles, take contact to pekka (at) Donation is not mandatory or precondition to download puzzles.

Puzzles to download:

AI Sudoku Top10 set:1

AI Sudoku Conflict Examples