🎯 Goal: Fill the 9×9 grid so that each row, column, and 3×3 box contains all digits 1-9.
🖱️ Controls: Click a cell to select it, then click a number or use keyboard (1-9). Use Clear to remove numbers.
💡 Hints: Get stuck? Use the Hint button for help (limited uses).
✅ Check: Validate your current solution at any time.