Smart Sudoku

* Sudoku is the best game for training your brain. The aim of the game is to place 1 to 9 into each grid cell so that each number can only appear once in each row, each column and each mini-grid.
* This game is designed with basic colors: black, white, gray, yellow and having an interface that helps player concentrate to play. This game is suitable for sudoku beginner to sudoku expert.
* Features:
- 2 input methods: digit first, cell first
- Endless game
- 7 levels: beginner, very easy, easy, medium, hard, very hard, and expert
- Pencil marks
- Manual hints to help you complete hard ones
- Auto-save
- Load and Save