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 1

Why 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.