Explore Sudoku Levels
- Play Beginner Sudoku - Perfect for new players.
- Play Easy Sudoku - Relaxing challenges.
- Play Medium Sudoku - Great for brain training.
- Play Hard Sudoku - Advanced strategies required.
- Play Monster Sudoku - Expert level only.
What is Sudoku?
Sudoku is a logic-based, combinatorial 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 contain all of the digits from 1 to 9.
Sudoku Monster generates unique puzzles instantly using a backtracking algorithm and Latin Square permutations, ensuring every game is fresh.
How to Play: The 3 Rules
| Element | Constraint |
|---|---|
| Row | Must contain numbers 1-9 exactly once. |
| Column | Must contain numbers 1-9 exactly once. |
| Box (3x3) | Must contain numbers 1-9. |
Daily Sudoku Challenge
Join thousands of players today in our Daily Sudoku Challenge. Solve a unique, hand-picked puzzle every 24 hours and maintain your streak. Compete on global leaderboards.
Is Sudoku Good for Your Brain?
Yes! Regular play improves memory, concentration, and logical thinking. It reduces anxiety by providing a structured mental workout.
Sudoku Strategy Guide
Learn advanced techniques like Scanning, Naked Pairs, and X-Wings to solve even the hardest Evil Sudoku levels. Use our built-in Note Mode to track candidates.
- Scanning: Look for rows/cols that eliminate options in a box.
- Candidate Marking: Write small numbers to track possibilities.
- Naked Pairs: If two cells have only [2,7], remove 2 and 7 from the rest of the row.
Sudoku Glossary
- Cell
- A single square in the grid.
- House
- A row, column, or 3x3 box.
- Candidate
- A potential number for a specific cell.
- Given
- Numbers provided at the start of the puzzle.
Sudoku Monster is fully responsive, works offline via PWA, and requires no download. Join thousands of players today.
Frequently Asked Questions
- How do I remove ads?
- You can remove ads by purchasing the Monster Pass or the one-time No Ads unlock.
- Is Sudoku Monster free?
- Yes, the core game is 100% free to play online.
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