Agar

Agar in agar.io are the main way of growing in the game.

Agar are represented by at first, hexagonal shaped colours which turn into circles as you grow bigger.

Agar provide 1 point to your size regardless of your mass.

There is another way of growing in the game which is by consuming other players, to do so you must be bigger than them and get very close to their cells. When you eat an enemy cell the amount you grow is as much as the size of the consumed player.