🎯 Sudoku

Sudoku is a classic logic puzzle where you fill a 9×9 grid with numbers 1-9.

Rules:

• Each row must contain the numbers 1-9 without repetition
• Each column must contain the numbers 1-9 without repetition
• Each 3×3 box must contain the numbers 1-9 without repetition

How to Play:

• Click a cell to select it
• Use arrow keys to navigate (automatically skips given cells)
• Click a number on the keyboard or press 1-9 on your keyboard
• Press Delete/Backspace or click "Clear" to erase a cell
• Cells with the same number are highlighted to help you spot patterns
• Gray cells are given numbers and cannot be changed
• Use Check Solution to verify your progress

Difficulty Levels:

• Beginner: 40-45 clues (easiest)
• Easy: 35-40 clues
• Medium: 30-35 clues
• Hard: 25-30 clues
• Expert: 20-25 clues (hardest)