Find the green orbs and stay away from the red. For the even sharper minded out there play on Hard setting and find the green orbs in the right order. Find the orbs quickly and get bonus points.
Click on a blue orb to see what colour is hidden - green is what you are looking for and red is bad. Find all the green orbs to win. Complete all 15 levels if you can...
A context menu should be shown when right-clicking or, on touch devices, long-pressing in the game. This menu especially allows to play in full screen and control the volume.