Contact us
We welcome reports about Sudoku explanations, image recognition, usability and translations, as well as suggestions for learning resources. Please email the address below.
To help us reproduce a problem, include the page and language, your device and browser, what happened and what you expected. For a puzzle issue, you can include its 81-digit string. Sending images or screenshots is your choice.
Do not send passwords, verification codes, recovery phrases or unnecessary identity information. Attachments pass through the email provider; please obscure personal information in screenshots first.
The site operator checks this mailbox manually; it is not live support. You can use the same address for complaints, privacy or security concerns. Please check your spam folder for replies too.
Privacy & complaints