Deeeep.io is one of the most addictive flash games. In the underwater world of Deeeep.io, your main goal is survival. Starting to choose your animal and eating as much food as possible to grow, it is not easy because the sea is a dangerous place full of predators, away from animals more significant than you. Fill the XP bar at the bottom of the screen and turn into a new, stronger, stronger creature. The critical thing in Deeeep.io is to keep an eye on the oxygen meter because some animals cannot breathe in the water as long as seagulls, but they can fly above the water instead of this. Play Deeeep.io and become the sea king.