This game is peaceful and relaxing to use and that is it’s main purpose after all. Other sudoku games have unnecessary complications and distracting graphics. Having to change modes in order to note or place ruins the flow. How can you relax and concentrate with unnerving flashing and every time you place a number? The worst one actually rotates and blinks all the numbers and sends congratulatory messages every time you complete a row. Jeez, give it a rest. This game is the best because every aspect is simple, all on one screen, everything you need and nothing you don’t. Now, if I could just do away with those annoying ads...