There are many interesting unblocked io games and agario is one of them. As it is easy and fun, many players like playing agar io. At the beginning of the game, you have a small blob. Move it around the playground, find some pellets to eat and grow. If you find smaller blobs, you can eat them as well but not the bigger ones! On contrary, they can eat you. So, stay away from them or split your blob into two pieces and give them something to eat. There are also viruses in the game. You can feed them to attack bigger blobs as well. Enjoy!