Turn your volume down because B-221 is very loud. B-221's Speed: Lightspeed B-221 will spawn at B-000. In 3 seconds, it will start speeding through the latest room. After B-221 has reached the latest room, it will strongly throw lockers around, breaking them. After it's finished doing that, it will speed back towards B-000, rebounding. After that, it will despawn.
