BATKu

ATKU is the world's fastest PC-based SUDOKU solver/generator. Will solve any solvable sudoku in under .4 sec and 99% of all sudokus in under .5 ms.

It has UI interface compatible with Windows. Requires no additional software or O/S modifications other than Shell 4.71 or higher. Generates millions of unique sudokus with 3 levels of difficulty (Easy, Medium and Expert). Outputs sudokus to screen, printer or disk file (6 sudokus per printer/disk file capable of fitting on an 8.5x11 paper unformatted).