When a Rule Needs Explaining
Short, exact answers to the questions readers ask most. If yours is missing, send it to us.
Do I need maths beyond basic arithmetic?
No. Number grids use counting and simple addition, and the walkthroughs show every sum. Everything else relies on careful reading and elimination.
Will these puzzles raise my IQ or protect my memory?
We make no such claims. The challenges are an enjoyable reasoning break, not a medical, therapeutic or cognitive programme. If you have concerns about memory or health, please speak to a qualified professional.
How long should a challenge take?
As long as you like. There are no timers. Many readers spend five to fifteen minutes; some return to a puzzle later in the day, which is a perfectly good way to solve.
Is it cheating to open the walkthrough?
No. The walkthrough is part of the puzzle. It shows every step, names the tempting wrong turn and explains why it fails, so a mistake becomes something you can learn from.
What does the difficulty description mean?
It is a plain-language note about how many clues interact and where the key step lies — for example, "two clues do most of the work once combined". It is deliberately not a number or score.
Why do you say never to guess in number grids?
Our grids are built so logic alone is enough. Guessing hides the reason behind each placement, so a wrong guess can spread unnoticed. See the number grid techniques.
What if I find two valid answers?
Please tell us through Report a Clue. Every puzzle should have exactly one solution. We check reports, correct the wording and note the change on the page.
Can I print or share the puzzles?
You may print them for personal, family or classroom use and share links freely. Republishing puzzles elsewhere requires written permission; see our terms.
Do you track my progress or require an account?
No. There are no accounts, scores or progress tracking. Details are in our privacy notice.
A rule that needs explaining is a rule we can write better. Questions make the puzzles fairer.