Sudoku Puzzle Game

Can one of you is a shortage, difficult or easy as you want at a moderate level, and age, with younger children and a thought-provoking for you so that developers everywhere can play Sudoku puzzle game. After you start the game you choose, how much time he spent on the game, which is the last step that remains is below all records when bored can easily close the game and then you can continue where you left off. Do not run to waste your time or play Sudoku :)