The player is a nameless adventurer “who is venturing into this dangerous land in search of wealth and adventure”. Flatheads, who reigned supreme over the GUE. The instruction manual to the Zork Glenn’s complete bicycle manual pdf tells the reader that there were twelve rulers from this family, referencing the book “The Lives of the Twelve Flatheads”. Some Flatheads are named after historical figures.
The exception to this rule occurs when the player must use a spray can of grue repellent to navigate dark areas requiring an empty inventory in order to traverse. The player steps into the deliberately vague role of an “adventurer”. The game begins near a white house in a small, self-contained area. Although the player is given little instruction, the house provides an obvious point of interest. The objective of the game is not initially clear.
In the Zork games, the player is not limited to verb-noun commands, such as “take lamp”, “open mailbox”, and so forth. Instead, the parser supports more sophisticated sentences such as “put the lamp and sword in the case”, “look under the rug”, and “drop all except lantern”. The game understands many common verbs, including “take”, “drop”, “examine”, “attack”, “climb”, “open”, “close”, “count”, and many more. The game uses a simple two-word parser that later adventure games imitated.
Woods contacted Crowther and received his permission to make an improved version which also spread to many locations, including the PDP-10 systems at MIT. By the summer of 1977 the DM group’s game was runnable, although only about one-half its final 1 MB size. The imps continued working on the game over the next year, adding areas and puzzles, with major development completed by the fall of 1978. The last addition was not made until February 1979 but development continued on bug fixes and touchups, with the last mainframe release in January 1981. ITS to not allow access to the directory containing the source code.
In the late 1980s the Fortran version was extensively rewritten for VAX Fortran and became fully compatible with the last MDL release. Use of gdt requires answering a random question requiring deep knowledge of the game. It was used as an acceptance test to verify that the OS had been correctly installed. Being able to compile, link, and run the program demonstrated that all of the run-time libraries, compiler, and link editor were installed in the correct locations.
A FORTRAN version was running in an IBM 370 port in the Constituyentes Atomic Center, Argentina, around 1984. The Z-machine would be ported to various platforms in shells known as the “Z-machine Interpreter Program” or ZIP. Using rented time on a TOPS-20 machine, they built the first ZIP in 1979. 100 or so locations including everything above ground and a large section surrounding the Round Room. The map was modified to make it more logical and seal off exits that led to no longer-existing areas. Berez became the president of Infocom. The new game was running on TOPS-20 ZIP and a new PDP-11 version of the Z-machine by the end of 1979.
June PS agreed to distribute the game in June. November 1980, when it shipped a copy on 8-inch floppy along with a hand-copied version of the manual. Sales of the TRS-80 version though PS began the next month, selling 1,500 copies over the next nine months. February 1981 and PS sold 6,000 copies by September. Lebling began converting the remaining half of the map to ZIL. PS in April and licensed in June 1981, but Infocom worried about PS’s commitment to the game. Infocom, Infocom agreed that if an Infocom copyright notice was put on the Fortran version, noncommercial distribution would be allowed.