It is the onslaught of the Goolies, the spherical cute looking things who multiply faster then rabbits. Moreover, they are doing what they do best, multiplying more rapidly than you can handle. The only way to stop them is by clicking on the like colored Goolies that are in clusters. But they have to be in groups of three or more to be able to detonate them! Larger groups earn you bonus to increase your score. So blow the Goolies away!!!