How to Play
- Goal: Fill the 9×9 grid so each row, column, and 3×3 box contains digits 1-9
- Navigate: Click/tap cells or use arrow keys to move around
- Enter numbers: Type 1-9 on your keyboard, or press Delete/Backspace to clear
- Mobile: Tap a cell and your keyboard will appear automatically
- Pencil marks: Enable pencil mode to add small candidate numbers for logic solving
- Hints: Get a correct number filled in when stuck
- Undo/Redo: Take back moves or redo them with the arrow buttons
- Auto-Check: Enable to validate moves in real-time as you play
- Highlight: Enable to see related cells (same row, column, box) when selected
- Dark Mode: Click the moon icon to toggle dark/light theme
- Print: Print your current puzzle and solution on separate pages (or save as PDF)
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