Pakuio game is all about how big mouths eat the small mouths. The more you eat, the bigger you become and in this way, you can win the game. The mouth size can increase only up to a certain minimum level but it tries to increase at all costs.
In Paku.io game, the mouth can be controlled by the use of mouth and there are dots which you need to collect to increase the size of the mouth. It is one of the easiest games to play where you have to connect all the dots to win.