Sudoku Challenges 1000 !!

This is the classic Sudoku puzzle game. It offers unique 1000 Sudoku puzzles from moderately easy to hard.
With total brainteasers, It is great app to train your brain, and sharpen your logical thinking and solving skills.
This app is simple and intuitive user interface. All Sudoku puzzles could be solved with pure logic and have one correct answer.
This app provides all necessary features, but not too many features that kill competitiveness of the game.
Some Features:
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- 1000 unique puzzles!!
- Clean and intuitive interface.
- Classic brainteasers from easy to hard.
- Pure logic puzzles, only one correct answer, no guessing needed.
- Auto real time error-checking.
- Auto save when game is interrupted and resume where you left off.
- Hints to show the answer for the selected square. (Please use hint wisely, otherwise usage of hint hurts your score. No hint function after No. 550.)
- Manual taking notes.
- Statistics to keep track of your progress.
- Leader boards to compare your score with other people in the world.