 SCP-591 refers to a line of video game consoles, originally developed as a counterfeit of the Nintendo Entertainment System, NES. SCP-591 was labeled as Pretendo in 1985, and manufactured in Southeast Asia. Official records indicate that the Pretendo brand was bought by another company, Dr. Wondertainment, supposedly to establish themselves in the growing video game market. Pretendo was then re-engineered as a standalone console system that was capable of playing both NES games and Dr. Wondertainment's own line of 8-bit video game titles, hereby referred to as SCP-591 Number. Whenever SCP-591 Number is inserted into SCP-591 and activated, it creates a minimized and isolated CK-class reality restructuring scenario that resembles the game's intended content.