Glork.io is a good Agario style-based Free For All Io game. Take control of a virus and try to build a superbug as fast as possible if you want to dominate the map! Once you achieve the goal, you are able to resist every known medicine. After you spawn, you should infect host cells and upgrade the own resistance. Meanwhile, do not forget to avoid running into defenses. If the target gets sick, they will use something to remove your fighters. Good luck!
Instructions: Use the mouse to control viruses, Space to recenter the mouse when you lose track of your player.