Where to write
Email is the only channel: support@pyxl.pro. There is no contact form, phone line or chat, so nothing you send passes through this site, and we read every message.
What to include
About a puzzle: the form (A, B or quick) and the question number, or the result link, which holds your answers in its address. About a page: the address and the sentence or figure you think is wrong, with a source if you have one.
Reporting a mistake
A report about a puzzle is checked against its verifier and its explanation. If you are right, the item is replaced and the forms are rebuilt. A report about a page is compared with its source, and the page and its date change together.