Sudoku - Free Online Logic Game
Fill the 9x9 grid with numbers 1-9 following classic rules
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Fill the 9x9 grid with numbers 1-9 following classic rules
About Sudoku
Sudoku is a classic logic puzzle game that challenges your reasoning abilities. Fill the 9x9 grid with numbers 1-9, following the rule that each row, column, and 3x3 box contains each number exactly once. Perfect for brain training and developing logical thinking skills.
Objective
Fill the entire 9x9 grid so that each row, column, and 3x3 box contains all digits from 1 to 9 without repetition.
Controls
Click on a cell to select it, then click a number or use keyboard (1-9) to enter the value. Click again or press Delete to clear a cell.
📋 How to Play
Start by looking for cells where only one number can fit
Use logic to eliminate possibilities in each row, column, and 3x3 box
Fill in numbers you're confident about
Continue eliminating possibilities until the grid is complete
⚖️ Game Rules
- ✓Each row must contain digits 1-9 with no repeats
- ✓Each column must contain digits 1-9 with no repeats
- ✓Each 3x3 box must contain digits 1-9 with no repeats
- ✓Pre-filled numbers (clues) cannot be changed
- ✓Only one solution exists for each puzzle
💡 Strategy Tips
Look for "naked singles" - cells where only one number can go
Look for "hidden singles" - numbers that can only go in one place in a row, column, or box
Use the process of elimination systematically
Focus on rows, columns, and boxes with more numbers already filled
If stuck, use candidate marking to track possible numbers in each cell