Portal.io is a free game developed by PayePlay for Android users. It is a highly addictive game where you control a portal that moves around the screen and sucks everything that comes near it. The goal is to make your portal as big as possible and swallow everyone in your way.

The game is easy to play, and the controls are simple to understand. You move your portal around the screen by swiping in the direction you want it to go. The more objects your portal sucks in, the bigger it becomes, allowing you to swallow larger objects and even other portals.

Portal.io also features an online rank where you can compete with your friends to see who can get the highest score. The game is fast-paced and challenging, keeping you engaged for hours on end. Overall, Portal.io is a fun and addictive game that is worth checking out.