Tim Anderson helped create Zork; one of the first works of interactive fiction (a form of adventure game), was an early descendant of ADVENT (also known as Colossal Cave Adventure). The first version of Zork was written in 1977–1979 on a DEC PDP-10 computer by Tim Anderson, Marc Blank , Bruce Daniels , and Dave Lebling, and implemented in the MDL programming language. All four were members of the Dynamic Modelling Group at the MIT AI Lab.