This is the third one in the series, there are 15 puzzles and 1 draw screen to work with. Once you have solved the puzzles that you are working on, all you have to do is tap the screen 3 times quickly to clear the screen to move on to the next one, if you push the home button on the device it will save the last place that you were then all you do is go back to the puzzles and continue. If you use the draw screen, when you move your finger on the screen it show a black line and if you tap the screen it shows a red dot.