1)   Deskop Sudoku 5.0
Play unlimited sudoku puzzles on your pc with just one sudoku download. Desktop Sudoku is a fun and easy to use puzzle game for beginners and expert sudoku players alike.

 2)   Sudoku Pocket for the Pocket PC (Windows Mobile) 2.01
One of the web's most popular Sudoku puzzle games for the Pocket PC/Windows Mobile platform. This version includes thousands of Sudoku puzzles for you to play. Complete with skinnable interface and multiple puzzle entry methods.