Agar.io was the first io game to really capture the attention of the public, it is without a doubt the most known io game out there and has inspired several other developers. Start of as a small blob and aim to become the biggest by eating the food that spawns around the map, you can also grow by eating other players. In Agario you’re able to eat anyone smaller than you which means you can be eaten by anyone bigger, trust no one as its survival of the fittest! You have 2 abilities, the first is the ability to split your body into 2 equal pieces which can be useful for catching up to prey or avoiding a bigger player. The second is the ability to drop bits of mass which you can use to help someone out or bait them into coming closer.
Move around with the mouse, use space bar to split in half and use W to drop some mass.
Play Agar.io Unblocked at school