Sudoku Daily

Sudoku Daily is a free browser logic game built around the classic 9×9 number grid. Every row, column and 3×3 box must contain the digits 1 to 9 exactly once. Each puzzle is generated from a complete solution and then carefully hollowed out while a solution counter proves there is only one answer. Choose Easy with roughly 40–45 empty cells, Medium with 46–50, or Hard with 51–55. The daily challenge uses a date seed, so everyone who plays on the same day receives exactly the same grid; append ?seed=YYYYMMDD to the page URL to replay a specific day. Enter numbers with the keypad or keyboard, keep candidate notes when the logic gets tight, mark conflicts without losing the attempt, ask for one of three hints, and use Check to reveal incorrect entries. Filled cells build your score, and a completed puzzle adds a time and difficulty bonus; each difficulty keeps its own best time. The timer stops when you pause, the best time for each difficulty is saved by the HappyBiu Shell, and no account or personal data is required.

How to play

• Tap a cell, then choose a number from the keypad. Every number appears once in each row, column and 3×3 box.
• Use the arrow keys to move and 1–9 to fill. Press Backspace to erase, N for notes, H for a hint, C to check and P to pause.
• Turning on Notes lets you pencil small candidates into an empty cell. Notes are removed automatically from peers when you place a number.
• Wrong numbers are allowed. Repeated digits are marked as conflicts immediately; the Check button shows every entry that differs from the solution.
• Three hints are included. After that, an optional rewarded hint is offered by the Shell; if no ad is available, the hint still arrives.
• The daily puzzle is seeded by the UTC date. Use the difficulty menu to change the number of empty cells without losing your saved best time.