Black Belt Sudoku for Windows

A Free Sudoku game for the PC with 567 puzzles that saves progress. Varying levels of difficulty in 7 belt grades, 81 puzzles for each. Includes 4 different icon sets, allowing you to choose between Numbers, Letters, Simpson Characters and Futurama Characters. Each puzzle will automatically save your best time for you to challenge your friends or just try to beat it yourself.

Version 1.03 includes plenty of additions and bug fixes.