6×6 Hard — Set 99
Solver Notes
Step up the difficulty with our collection of hard 6×6 Sudoku puzzles! These puzzles offer fewer starting clues and demand sharper logic than easy or medium grids. Perfect for intermediate solvers seeking a real mental workout, each free printable puzzle comes with a solution so you can check your work. Challenge yourself and see how fast you can crack these tricky 6×6 grids!
Frequently Asked Questions
What is a 6×6 Sudoku puzzle?
A 6×6 Sudoku uses a grid of 6 rows and 6 columns divided into 3×2 boxes. Fill each row, column, and box with 1–6 without repeating.
How hard is Hard difficulty?
About 30–40% of cells are pre-filled. You'll need strategies like hidden pairs and box-line reduction. Typical solving time is 15–30 minutes.
Can I print these puzzles?
Yes! Click the Print button for a clean, printer-friendly version. You can also download a PDF.
Are these puzzles free?
All puzzles on Easy Sudoku Print are 100% free to use, print, and share for personal or educational purposes.