Sudoku Difficulty Guide
Choose the right level, solve with confidence, and improve steadily.
On Pro Sudoku, difficulty is based on how many starting clues (givens) are left in the grid and how much logic depth is needed. Easier levels contain more givens and more direct moves. Harder levels contain fewer givens and require candidate tracking, pattern recognition, and multi-step reasoning.
Easy (45-50 givens)
Best for beginners, kids, and casual players. You can solve many cells using last free cell, last possible number, and obvious singles. Start here if you are new or returning after a break.
Medium (35-40 givens)
A balanced daily challenge. In addition to singles, you may need hidden singles and light candidate elimination. Great for building consistency and speed.
Hard (28-34 givens)
Designed for experienced solvers. Notes become essential. Expect naked/hidden pairs and triples, and occasional advanced eliminations. Focus on structure instead of guessing.
Expert (22-27 givens)
For puzzle enthusiasts who enjoy deep logic. You may encounter advanced ideas like X-Wing, Swordfish, and chain-style reasoning. Use the Techniques page as your companion.
How to progress
- Play 5-10 puzzles at one level before moving up.
- Use notes consistently once you reach Medium.
- Review one new technique at a time.
- If stuck often, drop down one level and rebuild flow.