Braains.io, is a team-based io game where you are either on the zombie side or on the human side.
Braains, as you can imagine from its title, is a zombie survival game and a lot of fun! Each server can have up to 50 players, 1 of whom starts as zombies and his goal is to spread infections by tagging people. The human goal, of course, has to survive the entire match without being tagged, but it is difficult to overcome them, so it is recommended that you barricade yourself in a safe place with other players.
Braains is a great io version of the zombie tag, if you start as zombies your goal is to tag people and turn them into zombies so you won't be alone. When you infect others, they will help you in the hunt to infect all people. Inside the map are several buildings with entrances and debris that will block these entrances, keep that in mind and try not to accidentally ruin your teammates sitting safely in barricaded houses because they will not be very happy. Teamwork is a must to succeed in this game, if you have more than one person collaborating and blocking an entry, your chances of survival are much higher, so keep that in mind!