Sudoku

Game Description

Sudoku is a classic logic-based number placement puzzle. Fill the 9×9 grid so that each row, column, and each of the nine 3×3 subgrids contain all digits from 1 to 9 without repetition.

Basic Rules & Controls

1. Each puzzle starts with some numbers already filled in
2. Fill empty cells with digits 1-9 following these rules:
3. 1. Each row must contain all digits 1-9 without repetition
4. 2. Each column must contain all digits 1-9 without repetition
5. 3. Each 3×3 box must contain all digits 1-9 without repetition
6. Use logic and elimination to determine the correct numbers
7. Click/tap a cell to select it, then choose a number from the number pad
8. Use pencil marks for notes to track possible numbers

Pro Tips & Strategies

• ✓ Start with cells that have the fewest possibilities
• ✓ Look for 'naked singles' (cells with only one possible number)
• ✓ Use 'hidden singles' technique (a number that can only go in one cell in a row/column/box)
• ✓ Eliminate possibilities systematically
• ✓ Take breaks - fresh eyes often spot patterns more easily

💡 Quick Start: Just click/tap to begin! No registration required. All Knexio games work directly in your browser with no downloads needed.