OpenSudoku is a simple open source Sudoku game. It’s designed to be controlled both by finger and keyboard. It’s preloaded with 90 puzzles in 3 difficulty levels, more puzzles can be downloaded from the web and it also allows you to enter your own puzzles.

Changes:

Support for Android 1.6
Support for QVGA screens
Solves issue #11 – Disable numbers when used 9-times
Solves issue #16 – Remember input mode between games

http://code.google.com/p/opensudoku-android/