🧩 Sudoku

📖 How to Play Sudoku

Sudoku is a classic logic-based number puzzle. Fill the 9×9 grid so that each row, column, and 3×3 box contains the digits 1-9 exactly once.

🧩 The Rules

1. Each row must contain digits 1-9 with no repetition.
2. Each column must contain digits 1-9 with no repetition.
3. Each 3×3 box must contain digits 1-9 with no repetition.

🎮 Controls

• Click a cell — Select it for input
• Type 1-9 — Enter a number in the selected cell
• Backspace/Delete — Clear the selected cell
• Arrow keys — Navigate between cells

🛠️ Game Features

• New Game — Start a fresh puzzle
• Get Tip — Reveal one correct cell when you're stuck
• Check — Verify if your current entries are correct
• Undo — Revert your last move

💡 Solving Strategies

• Scanning — Look for rows/columns/boxes with few empty cells
• Elimination — For each empty cell, eliminate impossible numbers
• Single candidate — If only one number fits, it must be the answer
• Hidden singles — If a number can only go in one place in a row/column/box, place it there