The Slender Man soon became very popular on the Internet. Many works of fanart, cosplay and fiction were created and spread from website to website. The first video series involving the Slender Man was published on YouTube. It is called "Marble Hornets", and is now one of the most popular Slender Man creations. Other YouTube serials about the Slender Man followed, including EverymanHYBRID and Tribe Twelve. In 2011, Markus "Notch" Persson, creator of the sandbox indie game "Minecraft", added a new character to the game. He named it the "Enderman" when many users on Reddit and Google+ commented on how similar it was to the Slender Man. A video game based on the Slender Man was released in 2012, named "Slender: The Eight Pages". Several popular variants of the game followed, including "Slenderman's Shadow" and "Slender Man" for iOS, which became the second most-popular app download. The sequel to "Slender: The Eight Pages", "Slender: The Arrival", was released in 2013.