From imtoo.com:

ImTOO BlackBerry Sudoku is a highly cool and addictive blend of logic and lateral thinking to challenge you to fill a partially completed 9x9 grid with digits 1-9 without repeating any digits in each column, each row and each of the nine 3*3 boxes. This Sudoku is designed for BlackBerry mobile phone fans with games of three difficulty levels: easy, normal and difficult.

Features:
1. Provide 1000 Sudoku grids respectively for each difficulty level: easy, normal, difficult.
2. Keep track of your type history and allow you to undo or redo the type.
3. Suit all players from beginners to experts with different levels.
4. Hint the beginners which digit is the right one to help them master Sudoku game quickly.
5. Check whether it’s the right one after typing a digit in a cell. When you incorrectly placed a repetitive digit in the same row, column or 3*3 box, it will display the typed wrong digit in red, and the repetitive uneditable digit in yellow.
7. Allow you to choose the stage freely before starting a new game.
8. Keep track of your statistics, so you can see how much time you spend on the BlackBerry Sudoku and what difficult level and stage you are in.
9. Save the game anytime and allow you to resume the game.
10. High Scores for you to check the high scores you got. The score you get with the help of “Check” and “Hint” won’t be appeared on the High Scores.
11. Easy to use interface to get the beginners into the game in the quickest way.
12. Support BlackBerry OS version below 4.7.