Use the left mouse to drag the blue button.
Waterfalls 2 is an addicting puzzle game for you to play free online and check your skill. Your mission is to fill the white circle as fast as possible. To win the level, you should interact with the blue button. Click and drag it to the place where it can impact on the yellow flow. You can adjust it after that if you haven't yet found the appropriate position. The difficulty will increase in the next stages. So, you should think carefully before performing the action to save the time. Good luck!