This game for people from beginner to expert players. Whether you'd like to relax or keep mind active – pass your free time in a pleasant way!

Highlights
* Two playing modes: Normal and Challenge
* Five levels of difficulty: flash, easy, medium, hard, and expert
* More than 5,000 well-formed puzzles
* Sound Effect and background
* Game center and Statistic

The main features:
1. Challenge yourself figuring out your mistakes, or enable Auto-Check to see your mistakes as you go
2. Turn on Pencil mode to make notes as on paper. Each time you fill in a cell, notes are automatically updated!
3. Highlight duplicates to avoid repeating numbers in a row, column and block
4. Support Undo, Redo functions
5. Support sound effect and background to help you exciting to play game
6. Hints can guide you through the points when you are stuck
7. Highlighting of a row, column and box related to the selected cell
8. Auto-save. If you leave a sudoku unfinished it will be saved. Continue playing anytime
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Challenge your brain anywhere, anytime!