Disclaimer
What this site is, what it is checked for, and — more usefully — what it does not claim.
The Puzzles Are Generated, And Generated Things Can Be Wrong
Every puzzle here is constructed by a program at the moment you load the page. That is what makes the supply unlimited and the explanations possible, and it is also the honest source of risk: a program can produce a puzzle that is subtly unanswerable, or one where a second option turns out to be defensible.
A great deal of checking goes into preventing that — every type has a test harness that generates thousands of puzzles and verifies that exactly one option is correct, that the options differ visually rather than merely in markup, and that every wrong answer carries a named reason. None of that amounts to a guarantee, and it is not offered as one. If a puzzle looks wrong, please report it with the link.
This Is Not Preparation For Any Test Or Assessment
Some puzzle types on this site share names with formats used in school and workplace assessment. Where a page explains that overlap, it is describing where the terminology comes from — it is not a claim that playing here prepares you for any particular examination, qualification or selection process, and no such claim should be read into it.
Nothing here is affiliated with, endorsed by or connected to any examination board, test publisher or assessment provider. No score, streak or completion count on this site means anything outside this site.
Not Professional Advice
Content on this site is for entertainment and general interest. It is not educational, psychological, medical or professional advice of any kind, and it should not be used to assess anybody's ability, aptitude or suitability for anything.
Trademarks And Puzzle Names
Puzzle mechanics are not owned; the names some of them are marketed under are. Where a mechanic is best known by a trademarked name, this site uses a generic name in its URLs, titles and headings, and mentions the trademarked name only descriptively, in body copy, so that people searching for it can tell they are in the right place.
| Name used on this site | Also known as | Trademark held by |
|---|---|---|
| Calcudoku | KenKen | Nextoy LLC |
| Nonogram | Picross | Nintendo |
| Word wheel | Boggle | Hasbro |
| Hidoku | Hidato, Numbrix | Benedek; Parade |
| Grouping puzzle | Connections | The New York Times |
| Word scramble | Jumble | Tribune Content Agency |
All trademarks are the property of their respective owners. Their appearance here is descriptive use to identify a puzzle mechanic, and implies no affiliation, sponsorship or endorsement in either direction.
External Links
A few pages link outward for background — mostly to reference material on the history or mathematics of a puzzle. Those sites are not under our control, and linking to one is not an endorsement of it or of anything else it publishes.
Availability
The site is provided as it is, with no promise that it will be available, that it will keep working in any particular browser, or that any puzzle type will remain on it. Puzzle types have been removed before when they could not meet the standard the site sets, and that will happen again if it needs to. See the terms of use.