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📖 How to Play Sudoku

🎯 Objective

Fill every empty cell with a number so that each row, each column, and each box (thick-bordered group) contains every number exactly once — no repeats.

🔢 Grid Sizes by Level

• Level 1: 3×3 grid — numbers 1–3
• Levels 2–3: 4×4 grid — numbers 1–4 (2×2 boxes)
• Levels 4–6: 6×6 grid — numbers 1–6 (2×3 boxes)
• Levels 7–9: 9×9 grid — numbers 1–9 (3×3 boxes)

🎮 Controls

• Tap a cell to select it, then tap a number to fill it
• ✏️ pencil button — toggle note mode for possible numbers
• ⌫ eraser — clear a cell
• ↩ undo — reverse your last move
• You get 3 mistakes maximum — be careful!

💡 Tips

• Start with rows, columns, or boxes that are almost full
• Use pencil marks to track possible numbers
• If only one number can fit — that's the answer!
• Smaller grids are great for learning before 9×9

🏆 Hall of Fame

Complete a puzzle to save your time! Top 50 fastest per level are recorded.

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🏆 Hall of Fame

#	Player	Time