They also appear frequently in Sellbot Headquarters. They have a chance of appearing in the courtyard, as well as the Sellbot Factory area, and within the Factory itself. They can appear inside any room within the Factory, with the only exceptions being the Lobby, the Duct Room, and the Pipe Room. Two-Faces also appear frequently in the first round of the Sellbot Towers boss battle, as well as the second round in Skelecog form.
"Two-face" is a term used to describe someone that has multiple personalities; for example, they may act differently depending on the setting, or hide their opinion about something (e.g. In reality they dislike someone, but pretend to like them). The definition is correspondent to a backstabber.