First - why another Sudoku game?
Two reasons: its more than just Sudoku, it also includes full implementations of Killer Sudoku (or Samunamupure) and Kakuro, making Panoramic Ultimate Sudoku 3 games in one.
Second, Panoramic felt there wasn't a Sudoku game available for Windows Mobile that took full advantage of the platforms features. This game includes 10 skins, customizable backgrounds, a and responsive, finger friendly interface. Overall its an excellent gaming experience.
And its only $2.99 US
Check it out here: http://www.panoramicsoft.com/mobilegames/sudoku/Sudoku.php