This is a new game that I play in Facebook. The goal is simple: you have a required number of balls to hit each level. You start with one ball (pretty easy). Just click on any part of the screen where the other bouncing ball could hit you. You get bonus points when additional balls hit the one that hit you (thus, the name).
Now, the balls expand and disappear after a few seconds so the timing is important. At times I get frustrated when that last ball won't connect. Your participation is only on the first click, y'see.
The game is colorful & fun to watch and quite relaxing to listen to. Try it yourself!