Sudoku

Description

Game Rules:
1. Each cell can only contain one number from 1-9
2. No repeated numbers in any row
3. No repeated numbers in any column
4. No repeated numbers in any 3×3 box
Game Controls:
- Click on empty cells to select them
- Click number keys to input numbers
- Click clear button to delete numbers
- Use power-ups to help solve difficult puzzles
Power-up Guide:
- Hint: Automatically fill in a correct number
- Undo: Undo the last move
- Analyze: Show possible candidate numbers for selected cell