This fun Google Easter Egg first showed up in April 2012. If you type “zerg rush” into Google’s search box, your search results will be overtaken by wave after wave of red and yellow Google o’s. To get rid of these o’s, you’ll have to point-and-shoot—clicking on each o until it dies.
This Easter Egg is a nod to the popular Blizzard game, StarCraft, and a move that Zerg users make when they attack their opponents with waves of annoying, easily killable Zerglings.
At the end of the Google game, the o’s will form a “GG” symbol (“good game”), and you’ll get your results.