Sysquake Remote will solve any sudoku grid that has a unique solution.
Just fill all the known cells, and leave unknown ones empty. You can also
choose among two grids generated by Sysquake, an easy one and a more
challenging one. Other grids are available as PDF:
volume 1 (104 KB), 2
(130 KB), 3 (103 KB). Informations on sudoku can
be found everywhere, including in