Unlimited queens-style crown puzzles, four difficulty levels

One puzzle a day is a warm-up, not a workout. Unlimited mode generates a fresh board every time you press New puzzle — each one built on the spot and verified by a solver to have exactly one solution, so the quality never dips no matter how many you play. Choose Easy 6×6 to learn the rules, Medium 8×8 for a coffee-break solve, Hard 9×9 when you want to practice pair exclusion and counting arguments, or Expert 10×10 for boards that ask for everything in the strategy guide.

There is no login, no lives system and no daily cap; your best time for each size is tracked on your own device. New to the genre? Read how to play first, then come back and climb the sizes — and when you want the shared community challenge, today's daily puzzle and the archive are one tap away.