 Although the development dates make it contemporaneous with other seminal interactive fiction games such as "Adventure" and "Dungeon" (which went on to become the "Zork" series from Infocom), it remains relatively unknown due to the specialized computers and operating systems on which it ran.Two C-language ports exist, one by James Garnett while a graduate student at the University of Colorado, and another by Bob Sorem of the University of Minnesota (see illustration).The former is a line-by-line exact port in K&R-style C that runs on most Unix-flavor operating systems, while the latter is an adaptation with features not in Wolpert's original in Borland C that runs only under DOS/Windows.