A Sudoku puzzle begins with a table where some of the numbers are already in place, depending on the difficulty of the game. A complete puzzle is one in which each number from 1 to 9 appears only once in each of the 9 rows, columns and blocks. Study the table to find the numbers that can fit in each cell. Features - Enable "Automatic Check" to see your errors as you play - Enable "Pencil" to take notes. When you enter a number the notes are updated automatically - Duplicate numbers are highlighted to avoid repeating them in the same row, column or block - Use tips to find the correct number when you are not able to proceed - Monitor your progress statistics on each level of difficulty Highlights • Connect to Facebook and discover your ranking position • Four difficulty levels: Easy, Medium, Hard and Expert • Automatically stores your progress • Available for mobile phones and tablets • Simple and intuitive intece