Braains.io is the different type of io game because the system of the game is not similar compared to slither.io or diep.io styles. There are two team which are humans and zombies. Players who are humans have to hide from infection person or people because infection is highly contagious. You will become zombie if you get touched by zombies. In addition, you can use WASD for movement. Also, you can use boxes and barriers to block zombies movement into your side. The game provides chat system to contact your mates when you are running away from zombies. If you do not move in 200 seconds, the system of the game will throw you from server because of AFK.