You've used your 3 free hints today.
Watch a short ad to unlock one more hint.
Join thousands of daily solvers — no spam, ever.
Welcome to Sudoku Daily — the free, ad-supported Sudoku experience built for players who want a genuinely fresh challenge every morning.
Sudoku is a number-placement logic puzzle published in newspapers and apps worldwide. The objective is simple: fill a 9×9 grid so that every row, every column, and every 3×3 box contains the digits 1 through 9 exactly once. No mathematics is involved — only deductive reasoning.
Easy puzzles (36–40 given clues) can usually be solved with naked singles: cells where only one digit fits. They are ideal for new players or a quick 5-minute break.
Medium puzzles (28–35 clues) require spotting hidden singles — numbers that can only go in one place within a row or box even when other candidates exist. Most players finish in 8–15 minutes.
Hard puzzles (22–27 clues) demand naked pairs, pointing pairs, and box-line reductions. A typical solve takes 15–40 minutes.
Evil puzzles (17–21 clues) are near the theoretical minimum of 17 clues needed for a unique solution. They require X-Wing, Swordfish, and advanced coloring techniques. Even experienced players may need 60+ minutes.
Every day at midnight UTC, a new seed generates today's puzzle — identical for every player worldwide, so you can compare times with friends. Solve the daily puzzle to extend your streak counter. Missing a day resets it to 1.
Toggle pencil mode with the ✎ button (or press P) to jot candidate numbers in cells. Auto-candidate mode computes all legal candidates instantly using constraint elimination.
Stuck? Three free hints per day reveal a single safe cell. Need more? Watch a short rewarded ad to unlock one extra hint. Hints always use the easiest available deduction first (naked single → hidden single → random cell from solution).
No account required. All progress, streaks, and best times are stored in your browser's localStorage under versioned keys. Clearing browser data resets your stats.
Upgrade your desk setup — see our recommendations →Yes. Sudoku Daily is completely free. Revenue comes from non-intrusive banner ads displayed outside the game grid and optional rewarded ads for extra hints.
Yes. The daily puzzle resets at 00:00 UTC every day. All players worldwide receive the same puzzle, generated from a date-based seed. Your progress on the current day's puzzle is automatically saved.
Mathematical research has confirmed that any uniquely-solvable Sudoku requires at least 17 given clues. Our Evil difficulty uses 17–21 clues, the hardest range possible while guaranteeing a unique solution.
Pencil marks let you record candidate digits in a cell — the numbers you think might belong there. Toggle pencil mode with the pencil icon or press P. Auto-candidate mode fills in all legal candidates automatically based on current board state.
You earn a streak point for each calendar day (UTC) on which you complete the daily puzzle. Missing any day resets your current streak to 1. Your all-time best streak is always preserved.