Sudoku Online
What is Sudoku?
Sudoku is a logic‐based, number‐placement puzzle played on a 9×9 grid, divided into nine 3×3 subgrids. The goal is to fill every cell so that each row, column, and 3×3 box contains all digits from 1 to 9 exactly once. Originating in the late 1970s and popularized in Japan, Sudoku challenges pattern recognition and deductive reasoning—no advanced math required.
How it works
- Step 1: Select Difficulty - Choose Easy, Medium, or Hard from the dropdown.
- Step 2: Generate Puzzle - Click “Generate Sudoku” to load a fresh puzzle.
- Step 3: Fill Cells - Click or tap a blank cell and type a digit (1–9). Use the Check Move button to validate your current entry. Use Hint to reveal one correct number—limited by your chosen difficulty.
- Step 4: Track Your Time - The built-in timer starts on puzzle generation and stops when you click “Finish Puzzle.”
- Step 5: View Solution - If you get stuck, click “Show Solution” or navigate to the Solution page for the full answer.
- Step 6: Save & Resume - Your progress is auto-saved—return anytime to pick up where you left off.
- Step 7: Print or Share - Use “Print Sudoku” to get a clean, printable layout with your current puzzle.
FAQs
Can I get more than one hint?
Yes—hint availability depends on difficulty: 3 hints for Easy, 2 for Medium, 1 for Hard.
Does the tool validate my entire solution?
Click Check Move to validate all filled cells. To see the full solution, use Show Solution.
Will my progress be lost on refresh?
No—your entries and elapsed time are stored and will be restored when you revisit the puzzle page.
How do Daily Puzzles work?
| A unique puzzle per difficulty is generated for each calendar day. Simply click “Daily Puzzle” on the landing page to access it. |