Method
Set fair, proved twice, printed once.
A puzzle is a promise: everything you need is on the page, and exactly one answer survives. Here is how the promise is kept, and who makes it.
One truth
Every case has a single answer. Before a puzzle is allowed out, a solver that knows nothing but the printed rules works it blind and must reach that one answer. If two answers fit, the puzzle is rebuilt. If none does, it never existed.
Every wrong turn walked
A second check does the opposite job: it takes every wrong turn a reader could take and follows it to its end. In Longhand that means every false reading of the grid dies where the certificate says it does. In the deduction puzzles it means every shortcut that reaches the answer without the reasoning is known, named and closed.
Nothing off the page
No outside knowledge, no trick of wording, no rule the page does not state. When a solver would need an assumption the rules do not give, the rules are the bug, and they are rewritten before the puzzle is.
Who sets them
Nell Sayer is the name Hoot Hatch publishes its puzzle line under. The puzzles are set by a small studio in Finland with a generator built for exactly this: it composes a case around a known truth, then proves the case the way a reader would meet it. Where a book’s story is written by a program, its listing says so plainly.
What stays with you
The daily puzzles are free and will stay free. Your progress and your streak live in your own browser; there is no account to make, nothing is sent anywhere, and there are no ads and no trackers on this site.