First you will want to know that the max NP you can get from this game is 1000. So once you get over 1000 points in game you can quit unless your going for a high score. If you use my tips getting 1000 isnt a problem at all. So this game will give you an easy free 3000pts a day a tidy sum if I say so myself
Tip #1: ALWAYS keep your mouse at the top of the screen this will help you stay right under the target your trying to bubble. Often you will over or under shoot a target when the mouse is by the turtle.