The goal of the sudoku game is to fill the empty squares so that every row,column and 3x3 box contains each of the numbers from 1 to 9 exactly once. Solving a sudoku puzzle does not require knowledge of mathematics, simple logic suffices. In each sudoku puzzle, several digits have already been entered, these may not be changed. FEATURES:-5 Difficulties-Note system-Free hints-Autosave system-Max hints increased to 9 For sudoku players looking for a chalenge!!! NEW FEATURES!!! : - Added achievements-Added leaderboards for medium hard and very hard difficulties!