Braains.io is a popular Multiplayer iO game giving you two options for playing. You can become either a zombie or human in this awesome Math game. As a zombie, you must use your skills to approach the humans and try to tag them to turn them into a creepy zombie. Once tagging, they will become your members and you can rule the game easily. But if you are a human, you have to run away from hordes of zombies, try to find a shelter, cover yourself and don't let them touch you. Wish you luck!