Sudoko Challenge Hack 2.3

Sudoku Challenge is a great sudoku game. The game has beautiful images about student life like notebook, pencil, note,... which reminds you of your childhood.
There are up to 2000 puzzles divided into 4 levels: easy, normal, hard, expert.
The game is funny and relaxing. Just play Sudoku Master in your free time and have fun.
Features:
- 4 levels.
- Statistics tracking.
- beautiful effects.
- Hints to help you complete hard ones.