A-200, also known as "The Happy Scribble," is an entity that exists in all Rooms universes. The entity always will know where its target is at all times, and is an instant-kill on contact. Because it always knows where someone is, tables are ineffective against it. A-200 is a white drawing of a smiling face. Because it knows where a victim is, it will rebound if they leave their hiding spot. A-200 will always attack from the front, making itself known with an easily identifiable bang sound. On departure, it will make a wind sound. A-200 does not despawn until everyone is in a locker.
Fun fact: A-200 is canonically omniscient, which is why it always knows where you are. Another fact: Some of the other entities theorize A-200 is made out of air, which is how it also earned the nickname "The Air You Breathe."