This is the most powerful mobile Sudoku game that features a random Sudoku Generator which generates puzzles to match anyone's skill level.
The game also has an auto solve system which helps you solve the puzzles, including those created by yourself.
Impossible Sudoku Features:
- Five level difficulty,all quickly random generated.
- Create own game and auto solve it.
- Nine pretty skins.
- Auto pencil marks mode and manual mode.
- Load and save for 10 game states.
- Redo, Undo, and Statistics.
- Attractive graphics and high quality sound effects.
Thanks to shahram and corepda.

Another free game that is recommended for everyone in the UIQ 3 community: 
UNITED STATES and using