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