"Labyrinth" was followed in 1987 by "Maniac Mansion". "Maniac Mansion" was the creation of Ron Gilbert and Gary Winnick, and marked the debut of SCUMM, the game engine that powered all but two of LucasArts later adventure games. The game was also the first LucasArts adventure game to be released for DOS. "Maniac Mansion" was LucasArts' first full graphic adventure game, using a point-and-click interface rather than the text-based gameplay seen in "Labyrinth". A menu of verbs allows the player to choose how to interact with the game's environment. "Maniac Mansion" aims to parody the horror genre. The game was subject to several enhancements and re-releases, and was included as a game within a game in its sequel, "Day of the Tentacle".