Kyu Sudoku

A calm, paper-textured sudoku. Solve the day's puzzle before anyone you know, climb a quiet ladder of rank, and keep your data to yourself. DAILY CHALLENGE One board a day, the same for every player, resetting at midnight. Solve it against the clock, keep your streak alive, and see where you land on the public leaderboard, ranked by time, not luck. Miss a day and the streak resets; that's the whole stakes. There are no hints or second chances in this mode, so it stays fair for everyone. OR JUST PLAY Four difficulties from Easy to Expert, at your own pace, with a clock you can hide if it makes you rush. Three mistakes ends a grid. Take one second chance and the run still counts toward your best time, stats and badges. Set free hints from zero to four in Settings, and earn up to three bonus hints per puzzle with a short optional ad. KYŪ, NOT JUST A NAME Kyū (級) is the grading system martial arts and go use on the way up, before dan rank. Kyu Sudoku keeps sixteen flower badges across five axes: puzzles solved, leaderboard placement, streak length, hardest boards mastered, and Daily Challenges completed. KYU SUPPORTER A one-time purchase unlocks all three bonus hints on every puzzle and free second chances, forever, with no ads and a small mark on your profile. It buys convenience, never a win. The Daily Challenge stays free of hints and second chances for everyone. YOUR DATA STAYS YOURS • No account, no name, no email: just a random ID generated on your device • The leaderboard is the only reason anything leaves your phone • Only opt-in rewarded ads, non-personalized. No banners, no pop-ups, ever • No analytics SDK, no crash-reporting SDK Built by an independent developer.