Games are great.  Sudoku games are even better.  One of the best options for Windows Mobile, Resco Sudoku Touch has just been updated to version 1.50, incorporating a handful of worthwhile updates.  Read about the update here:

The easiest, yet challenging way to play Sudoku on your phone

Resco announced today the release of Resco Sudoku Touch v1.50 for Windows Mobile devices.

Resco Sudoku Touch now features a brand new puzzle engine, supports HD 480×800 display resolution and includes new backgrounds.

Resco Sudoku Touch is now available with 30% discount, and can be bought here.

Product page
Official Press Release

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3. Press Release – Astraware Sudoku Update
4. Resco is Preparing a Finger Friendly Version of Photo Viewer
5. Resco Releases Send SMS Gadget for Windows 7 as Feature of Resco Contact Manager, 2nd Ed.