something interesting on google

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there is something interesting on google,there is something interesting on google, when I type the word "zerg rush" in the google search, google search results disappear all at once, accompanied by a small egg appearance, really interesting. the emergence of a small egg that makes Google such as gaming, we are required to shoot the eggs eggs, and we'll know how much we managed to shoot. : D which makes me wonder if just the word "zerg rush" google will like it, or there are other words that could make google be interesting? for those who already know, share your experience here when you know it?