Sudoku - Free Online Number Puzzle Game. Play free Sudoku online at OnlinePuzzles.org. Classic 9x9 number placement puzzle. Multiple difficulty levels. No registration. Instant play. Brain training game. Part of FlameAI Studio puzzle network.
Sudoku
Sudoku is a classic number placement puzzle that challenges your logical thinking and pattern recognition skills. The goal is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 subgrids contains all of the digits from 1 to 9. This timeless puzzle game has been enjoyed by millions worldwide and is perfect for brain training and improving cognitive function.
Controls: Click cells to select, use number keys (1-9) to fill, Backspace/Delete to clear, P for pencil mode. Click Eraser button to clear selected cell.
About Sudoku
Sudoku is a classic number placement puzzle that challenges your logical thinking and pattern recognition skills. The goal is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 subgrids contains all of the digits from 1 to 9. This timeless puzzle game has been enjoyed by millions worldwide and is perfect for brain training and improving cognitive function.
How to Play
- Each row must contain the numbers 1-9 exactly once
- Each column must contain the numbers 1-9 exactly once
- Each 3x3 box must contain the numbers 1-9 exactly once
- Use logic and elimination to determine where each number belongs
- Start with cells that have the fewest possible options
Strategy Tips
- Look for cells with only one possible number (naked singles)
- Use pencil marks to track possible numbers for each cell
- Focus on rows, columns, or boxes that are nearly complete
- Eliminate possibilities by checking what numbers are already present
- Work systematically from easier cells to more complex ones
- Take breaks if you get stuck - fresh eyes help spot patterns
Frequently Asked Questions
What is Sudoku?
Sudoku is a logic-based number placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids contains all of the digits from 1 to 9.
How do I solve a Sudoku puzzle?
Start by identifying cells with only one possible number. Use elimination to narrow down possibilities, and work systematically through the grid. There is no guessing required - every puzzle can be solved using pure logic.
Are there different difficulty levels?
Yes, our Sudoku game offers multiple difficulty levels from Easy to Hard. Easy puzzles have more given numbers, while Hard puzzles require more advanced solving techniques.
Can I get hints?
Yes, our game includes a hint system that can help you when you're stuck. Use hints sparingly to maintain the challenge and improve your skills.
Is Sudoku good for brain training?
Yes! Sudoku exercises your logical thinking, pattern recognition, and problem-solving skills. Regular play can help improve cognitive function and mental agility.
Ready for More Challenges?
Explore our other puzzle games and improve your cognitive skills!
View All PuzzlesRelated Articles
Crossword vs Word Search: Which Challenges Word Players More?
Compare crossword vs word search challenge levels and learn which puzzle style tests different word skills.
Puzzle Games for Adults: Top Brain-Boosting Challenges
Discover top puzzle games for adults that provide brain-boosting challenges. Learn about engaging games that improve cognitive function and.
Beyond the Grid: Learning Adventure
Explore learning adventures beyond the Sudoku grid. Discover how puzzle solving extends to life skills and cognitive development.
Try Other Games
Number Puzzle
Slide tiles to arrange numbers in order.
Word Puzzle
Unscramble letters to form words.
Memory Match
Find matching pairs of cards.