Sudoku Guide
Learn Sudoku rules, difficulty levels, and solving tips. Get started with the classic 9×9 puzzle.
Rules
- The 9×9 grid is divided into nine 3×3 boxes.
- Each row, column, and 3×3 box must contain the digits 1–9 exactly once.
- Bold given numbers are pre-filled clues and cannot be changed.
- Fill all empty cells correctly to win.
Difficulty Overview
| Difficulty | Clues |
|---|---|
| Easy | 46 |
| Medium | 36 |
| Hard | 27 |
| Expert | 22 |
Solving Tips
- Scan rows, columns, and boxes for cells with only one possible candidate.
- Use Notes mode to pencil in candidates and eliminate them step by step.
- Prioritize rows, columns, or boxes that are only missing one digit.
- Start on Easy to learn the logic, then work up to Hard and Expert.