Google is no stranger to adding Easter eggs and weird features to Search. Do a quick Google search for “recursion,” “do a barrel roll,” or “Google in 1998” and you’ll see what I’m talking about.
Sometimes, they add useful functions, like medical conditions and symptoms or shopping lists, and sometimes we get things that are somewhere in the middle. This update lands somewhere in the middle.
If you’re bored and itching for a quick game to pass some time, you’ll now be able to perform a Google search for tic-tac-toe or solitaire and play a full game, right within the Google app or a desktop browser. Tic-tac-toe is actually pretty fun and gives you an easy, medium, or impossible difficulty, plus the option to play with a friend.
You can also search for what sounds a specific animal makes (like a dog, for instance) or search to flip a coin. At this point you’re not really searching for things, you’re using Google as a hub to launch into other activities without actually leaving the app. Seems like that’s what Google wants, too.
source: Google Blog