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This is the one we most want to hear about. Every logic grid, zebra, and knights-&-knaves puzzle carrying the ∎ badge has been through a constraint solver that confirmed exactly one arrangement satisfies all the clues — so a puzzle with no solution, or with two, means the check failed and we need to know.

Send the puzzle's URL and, if you have it, the arrangement you found. That is enough to reproduce it.

Include the page URL, what you expected, and what happened instead. If it involves your account, say which email address it is registered under — never send your password.

Requests to see, correct, or delete the data held about you go to the same address. What is collected and how long it is kept is set out in the Privacy Policy.

Corrections, licensing questions about the public-domain imports, and press enquiries are all welcome at the same address. See also About and Terms.