Beautiful relaxing music and okay hand writing recognition. App has a little trouble reading "5" and "7" at times. One suggestion would be to add a settings to toggle what numbers to drill. 0 to 25, 26 to 50, 51 to 75, 76 to 100, 0 to 100. Also would like the ability to drill +, -, x, / together as a 5th option on the home screen.