In Happy Glass, you need to help the water to flow in the right direction. Your objective is to grab a pencil and draw a line to manipulate the flow of the water to fill the glass. When you let go of the left mouse button the tap will be turned on and the water will start flowing. Spill too much water and you will need to retry the level. You can come up with your own solution.
how to play :
Use the left mouse button to release the amount of liquids.
Drag left mouse button to draw a line.