Home / About
About Silvera PuzzleClub
Silvera PuzzleClub is an independent puzzle site. It exists for one reason: to give you good, fair puzzles that load fast and play well on a phone or a computer, with no download and no account needed.
Fair puzzles, checked by software
Every puzzle on the site has exactly one solution, and we check that with code before it is published.
- Sudoku grids are generated by our own software. After each given is removed, a solver confirms that the grid still has a single solution.
- Nonograms are run through a line-by-line solver, so each one can be finished by logic alone without guessing.
- Mystery mini cases store every clue as a logical statement. A program tries every possible arrangement of suspects and confirms that exactly one fits all the clues.
- Mini crosswords are filled with the help of a word list and clued by hand. Riddles are classic riddles retold in our own words or written from scratch. Cryptograms use well-known quotations from classic authors.
How sudoku difficulty is rated
Counting the givens is a poor guide to difficulty, so each sudoku is graded by the techniques a person needs to solve it:
- Easy: naked and hidden singles are enough, with 36 or more givens.
- Medium: still singles only, but with about 30 givens, so finding the next move takes more scanning.
- Hard: needs at least one intermediate technique: locked candidates (pointing or claiming), naked pairs or hidden pairs.
- Expert: those techniques stall. You will need advanced methods such as X-Wing or chains.
- You can learn every one of these techniques in our sudoku techniques guide.
The daily sudoku
A new set of four daily sudoku puzzles appears every day at midnight Eastern Time. Everyone gets the same puzzles on the same day, and every past day stays available in the archive.
What we do not do
No advertising trackers and no fake numbers. We do not publish made-up player counts, reviews or rankings. You never need an account to play: your progress is stored in your own browser, and signing in with Google is only there if you want it on every device. Read the privacy policy for the details.
Get in touch
Found a puzzle that looks wrong, or have an idea for a new one? Write to contact@silverapuzzles.com. We read every message.