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You can also copy this address into your email application: [email protected].

Report a problem

Tell us what you were doing, what you expected and what happened instead. Include your browser, device and whether you were playing classic or X Sudoku.

For a puzzle problem, include its starting clues or a screenshot of the grid, along with the difficulty and assistance settings you used. For a daily puzzle, include the date. These details help us reproduce the problem.

Please crop screenshots to the relevant area and leave out passwords, account details and other private information.

Share an idea

If a control is difficult to use, an explanation is unclear, or you have an idea that would help you learn, tell us. Feedback from people playing on phones and computers helps guide improvements.

For rules and controls, the player’s guide may already have the answer. Learn more about the project on our About us page.