agar.io iOS gameplay short introduction to game

Agar.io is a massively multiplayer action game created by Matheus Valadares. Players control a cell in a map; the goal is to gain as much mass as possible by swallowing smaller cells without being swallowed by bigger ones. Try to survive and eat long enough to become the biggest cell in the game.

It's a very addictive multiplayer game, but the thing is you definitely need internet connection, so you'll be unable to play say for example in the underground. Other than that. Very addictive, lots of fun, many options to customise your cell's design.