The ARG Rooms are a set of locations in Hello Neighbor.
One of the rooms has a red circle with the words (Unreal Engine MissingScript). It was part of an ARG during the Alpha stage of the game's development. In Alpha 4, touching it brings the player to the Binary Code Room. In later versions it instead leads to an empty void.
The Binary Code Room is a small room with a textureless floor and walls, and a set of colored cubes. The ceiling is a black texture with binary code alluding to this website.
The binary reads:
"1003063 is running again. The second third is available. i need help. keep it a secret. if they find out, they might abridged me."