Zegutdan Sudoku Generator
This service lets you generate printable sudoku puzzles which you can print or print-to-pdf, and then work out with pencil and paper. There are 10.000 unique solvable puzzels available per difficulty level (60.000 total). You can easily print by clicking a puzzle!
The generator produces classic symmetrical puzzles of varying difficulty levels. The difficulty level (“Easiest”, “Easy”, “Medium”, “Hard”, “Very hard” and “Extreme”) appears on the printed page.