Objective
Fill the grid so that every row, column, and box contains all numbers from 1 to N (where N is the grid size).
Simple 4×4 Example
1
2
3
4
3
4
1
2
2
1
4
3
4
3
2
1
Blue cells are given clues, white cells you fill in
How to Play
- Click a cell to select it (highlighted in blue)
- Click a number from the number pad to place it
- Click a filled cell again to erase the number
- Use hints when you're stuck (limited per game)
💡 Remember: Each number can appear only once in each row, column, and box!
Grid Sizes & Rules
4×4
Use numbers 1-4
2×2 boxes
2×2 boxes
6×6
Use numbers 1-6
2×3 boxes
2×3 boxes
9×9
Use numbers 1-9
3×3 boxes (classic)
3×3 boxes (classic)
12×12
Use 1-9,A,B,C
3×4 boxes
3×4 boxes
1
2
3
4
5
6
7
8
9
A
B
C
Difficulty Levels
😊 Easy
More clues, perfect for beginners
😐 Medium
Balanced challenge for casual players
😤 Hard
Fewer clues, requires logic skills
😱 Expert
Minimal clues, for puzzle masters
Tip: Start with easier difficulties to learn patterns and strategies!
Game Features
- 🎲 Generate Puzzle: Create new random puzzles instantly
- 💡 Hint System: Get help when stuck (5 hints per game)
- ⏱️ Timer: Track your solving time for each puzzle
- ⭐ Scoring: Earn points based on difficulty and time
- 🌙 Dark Mode: Toggle between light and dark themes
- ✨ Auto-Solve: See the complete solution when needed
- 🔊 Sound Effects: Audio feedback for correct/wrong moves
- 📱 Responsive: Works perfectly on mobile and desktop
Strategy Tips
🔍 Scan for Singles
Look for cells where only one number can fit
📊 Use Elimination
Cross out numbers that can't go in certain cells
🎯 Focus on Constraints
Start with rows/columns/boxes with most numbers
🧩 Look for Patterns
Identify common Sudoku solving techniques
⏰ Take Your Time
Rushing leads to mistakes - think carefully
💡 Save Hints
Use hints only when truly stuck