9x9 Sudoku Puzzles by Difficulty
Welcome to Sudoku99 – the world’s most structured, professional-grade Sudoku site offering 150,000+ unique 9x9 puzzles across 20 difficulty levels. Every puzzle is hand-curated and guaranteed to have a single logical solution. No guesswork, just pure logic and fun.
Start with Level 1Why Sudoku99?
- 20 structured levels from 36 clues to 17 clues
- Over 150,000 handcrafted 9x9 puzzles – no repeats
- Guaranteed unique solution for every puzzle
- Fast, responsive, distraction-free play interface
- No registration required – instant play
- Printable puzzles in Word format
- Daily updated challenges and rankings
Select Your Challenge Level
Choose a Sudoku difficulty based on clue count. Levels are grouped by skill — from easy to expert gold.
Easy Sudoku
Perfect for beginners, these easy Sudoku puzzles offer a gentle challenge with more clues.
Medium Sudoku
Ideal for intermediate players seeking a balanced challenge.
Hard Sudoku
Great for advanced players, these puzzles reduce the clues further for deeper thinking.
Expert Sudoku
For seasoned solvers. Requires advanced strategy and logical precision.
Expert – Silver
Minimal clues for a real mental workout — designed for puzzle masters.
Expert – Gold
The ultimate test. Only for elite Sudoku solvers. Every move counts.
Frequently Asked Questions
- What makes Sudoku99 better than other sites?
- Our puzzles are pre-verified, structured, difficulty-balanced, and tested to ensure one and only one solution.
- Is Sudoku99 completely free?
- Yes. You can play, print, and access all levels without signing up or paying anything.
- Can I share my results or compare rankings?
- We offer printable options and daily challenges to track your performance.