Aquar.io

Aquar.io is an addictive underwater world where incredible adventures and funny battles are waiting for you.

Start playing with a single queen fish. Feed her and she will give birth to piranhas. Collect neutral creatures - they will join you. Grow your school of fish and merge small creatures into stronger ones. Over time, devour your school of fish to let your queen fish gain some experience. After gaining required amount of experience, your queen fish will advance to the next level of evolution and acquire some special ability.

And of course, fight the other players! You can collect a school of fish of the defeated player. Are you good enough to became a true master of the underwater world? Of course you are!