3. Agar.io
If you’re wondering just what this is and why it is so popular, then you must know it’s actually a… game. Yep, it’s a mobile game that has managed to make the world go nuts in 2015. Originally a web game, Agar.io made its way to mobile, allowing users to try to become the biggest cell in a petri dish by eating other players in their quest. You just have to survive and eat long enough to become the biggest link of the food chain. The game has tens of millions of installs on Android alone, with over 2.2 million people going as far as giving it a rating, which we all know isn’t something we do very often.
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