Acyd.io is an addicting free online multiplayer browser IO game in which you will have the chance to take part in a great combat. Control a small virus or something like that, help it become the biggest creature in the new environment as soon as possible to dominate. At the beginning of Acyd.io, try your best to enlarge by collecting green items and swallowing smaller players while keeping away from the stronger enemies to survive. The highest score and mass you obtain will support you a lot. Good luck!