Colossal Cave Adventure (also known as ADVENT, Colossal Cave, or Adventure) is a text adventure game, developed originally in 1976, by Will Crowther for the PDP-10 mainframe. The game was expanded upon in 1977, with help from Don Woods, and other programmers created variations on the game and ports to other systems in the following years. Colossal Cave Adventure is the first known work of interactive fiction and, as the first text adventure game, is considered the precursor for the adventure game genre. Colossal Cave Adventure also contributed towards the role playing and roguelike genres.