Interactive fiction

File:Zork mac screenshot.png

Zork, an early work of interactive fiction, running on a modern interpreter

Interactive fiction, often abbreviated IF, describes software simulating environments in which players use text commands to control characters and influence the environment. Works in this form can be understood as literary narratives and as computer games. In common usage, the word refers to text adventures, a type of adventure game with text-based input and output. The term is sometimes used to encompass the entirety of the medium, but is also sometimes used to distinguish games produced by the interactive fiction community from those created by games companies. It can also be used to distinguish the more modern style of such works, focusing on narrative and not necessarily falling into the adventure game genre at all, from the more traditional focus on puzzles. More expansive definitions of interactive fiction may refer to all adventure games, including wholly graphical adventures such as Myst.

As a commercial product, interactive fiction reached its peak in popularity in the 1980s, as a dominant software product marketed for home computers. Today, interactive fiction no longer appears to be commercially viable, but a constant stream of new works is produced by an online interactive fiction community, using freely available development systems. Most of these games can be downloaded for free from the Interactive Fiction Archive (see external links).

The term "interactive fiction" is also occasionally used to refer to hypertext fiction, collaborative fiction, or even a participatory novel, according to the New York Times. It is also used to refer to literary works that are not read in a linear fashion, but rather the reader is given choices at different points in the text; the reader's choice determines the flow and outcome of the story. The most famous example of this form of interactive fiction is the Choose Your Own Adventure book series. For others, see gamebooks.

The medium of interactive fiction

Text adventures are one of the oldest types of computer games and form a subset of the adventure genre. The player uses text input to control the game, and the game state is relayed to the player via text output.

Input is usually provided by the player in the form of simple sentences such as "get key" or "go east", which are interpreted by a parser. Parsers may vary in sophistication; the first text adventure parsers could only handle two-word sentences in the form of verb-noun pairs. Later parsers could handle increasing levels of complexity from sentences such as "open the red box with the green key then go north". This level of complexity is the standard for works of interactive fiction today.

Works of interactive fiction function like single-player Multi-User Dungeons or 'MUDs', and the original MUD was actually a multi-player generalization of Zork (one version of which was called Dungeon). MUDs, which became popular in the mid-1980s, rely on a textual exchange and accept similar commands from players as do works of IF, but the social aspects and the communities of players who participate are often the most important features of MUDs.

Interactive fiction usually relies on reading from a screen and on typing input, although speech synthesis allows blind and visually impaired users to play interactive fiction.

Writing style

Interactive fiction features two distinct modes of writing: the player input and the game output.

As described above, player input is expected to be in simple command form (imperative sentences). A typical command may be:

pull lever

The responses from the game are usually written from a second person point of view, in present tense. This is because, unlike in most works of fiction, the main character is closely associated with the player, and the events are seen to be happening as the player plays. While older text adventures often identified the protagonist with the player directly, newer games tend to have specific, well-defined protagonists with separate identities from the player. The classic essay "Crimes Against Mimesis" discusses, among other IF issues, the nature of "You" in interactive fiction.

A typical response may be:

You pull the lever. The door opens, and you are shocked to see a glittering treasure chest.

Many text adventures, particularly those designed for humour such as Zork or The Hitchhiker's Guide to the Galaxy use a very conversational and informal tone between the player and the game. The game may make sarcastic remarks, or witty observations which wouldn't normally be present in conventional writing. (See the transcript from Curses, below, for an example).

History

Adventure

Around 1975, Will Crowther wrote the first text adventure game, Adventure (originally called ADVENT because a filename could only be six characters long in its operating system, and later Colossal Cave). It was programmed in Fortran for the PDP-10. In 1976, Don Woods discovered Adventure while working at the Stanford Artificial Intelligence Laboratory, and obtained Crowther's permission to expand the game. Crowther's original version was a quite accurate simulation of the real Colossal Cave; Woods' changes were reminiscent of the writings of J.R.R. Tolkien, and included a troll, elves, and a volcano inspired by Mount Doom.

In 1976, the game began spreading on ARPANet, and has survived on the Internet to this day. The game has since been ported to many other operating systems.

The popularity of Adventure led to the wide success of interactive fiction during the late 1970s and the 1980s, when home computers had little, if any, graphics capability.

The commercial era

Infocom

The largest company producing works of interactive fiction was Infocom , which created the Zork series and many other titles; among them Trinity, The Hitchhiker's Guide to the Galaxy and A Mind Forever Voyaging.

In June of 1977, Marc Blank, Bruce K. Daniels, Tim Anderson, and Dave Lebling began writing the mainframe version of Zork (also known as Dungeon), at the MIT Laboratory for Computer Science. The game was programmed in a computer language called MDL, a variant of LISP. In early 1979, the game was completed. Ten members of the MIT Dynamics Modelling Group went on to join Infocom when it was incorporated later that year.

In order to make its games as portable as possible, Infocom developed the Z-Machine, a custom virtual machine which could be implemented on a large number of platforms, and which took standardized "story files" as input.

The company was bought by Activision in 1986 after the failure of Cornerstone, its database software program, and stopped producing text adventures a few years later.

In 1991 and 1992, Activision released volumes one and two of The Lost Treasures of Infocom, a collection containing most of Infocom's games, followed in 1996 by Classic Text Adventure Masterpieces of Infocom.

Adventure International

Adventure International was founded by Scott Adams (not the creator of Dilbert).

In 1978, Adams wrote Adventureland, which was loosely patterned after the original Advent. He took out a small ad in a computer magazine in order to promote and sell Adventureland, thus creating the first commercial adventure game. In 1979 he founded Adventure International, the first commercial publisher of interactive fiction. The company went bankrupt in 1985.

Legend Entertainment

Legend Entertainment was founded by Bob Bates and Mike Verdu in 1989. It started out from the ashes of Infocom.

The text adventures produced by Legend used (high-resolution) graphics as well as sound. Some of their titles include Eric the Unready, the Spellcasting series and Gateway (based on Frederik Pohl's novels).

The last text adventure created by Legend was Gateway II, while the last game ever was Unreal 2 (the well-known first person shooter action game). Legend was acquired in 2004 by Atari.

Other companies

Probably the first commercial work of interactive fiction produced outside the U.S. was the dungeon crawl game of Acheton, produced in Cambridge, England, by Topologika. Other leading companies in the U.K. were Magnetic Scrolls and Level 9 Computing. Also worthy of mention are Delta 4, Acornsoft, Melbourne House, and the homebrew company Zenobi.

In Japan, companies such as Data West developed limited interactive fiction games, such as the seven-volume murder mystery series Misty. Later, interactive fiction became more popular in Japan in the form of visual novels.

The modern era

After the demise of the commercial interactive fiction market in the 1990s, an online community eventually formed around the medium. In 1987, the Usenet newsgroup rec.arts.int-fiction was created (focusing on creating interactive fiction), and was soon followed by rec.games.int-fiction (which focuses on playing interactive fiction games).

One of the most important early developments was the reverse-engineering of Infocom's Z-Code format and Z-Machine virtual machine by the InfoTaskForce, a group of enthusiasts, in 1987, and the subsequent development of an interpreter for Z-Code story files. As a result, it became possible to play Infocom's work on modern computers.

For years amateurs formed a small community producing interactive fiction works of relatively limited scope using the Adventure Game Toolkit and similar tools. The breakthrough that allowed the interactive fiction community to truly prosper, however, was the creation and distribution of two sophisticated development systems. In 1987, Michael J. Roberts released TADS, a programming language designed to produce works of interactive fiction. In 1993, Graham Nelson released Inform, a programming language and set of libraries which compiled to a Z-Code story file. Each of these systems allowed anyone with sufficient time and dedication to create a game, and caused a growth boom in the online interactive fiction community.

Despite the lack of commercial support, the availability of high quality tools allowed enthusiasts of the genre to develop new high quality games. Competitions such as the annual Interactive Fiction Competition for short works, the newer Spring Thing for longer works, and the XYZZY Awards, further helped to improve the quality and complexity of the games. Modern games go much further than the original "Adventure" style, improving upon Infocom games - which relied extensively on puzzle solving, and to a lesser extent on communication with non player characters - to include experimentation with writing and story-telling techniques.

While the majority of modern interactive fiction developed is distributed for free, there are some commercial endeavors, including Peter Nepstad's 1893: A World's Fair Mystery, several games by Howard Sherman published as Malinche Entertainment, and The General Coffee Company's Future Boy!. Emily Short was commissioned to develop the game City of Secrets but the project fell through and she ended up releasing it herself. Some authors offer optional commercial "feelies" (physical props associated with a game) through feelies.org or similar services.

Notable works of interactive fiction

• Colossal Cave Adventure by Will Crowther and Don Woods was the first text adventure ever made.
• The Zork series by Infocom (1979- ) was the first text adventure to see widespread commercial release.
• The Hobbit by Philip Mitchell and Veronika Megler of Beam Software (1982) was an early reinterpretation of an existing novel into interactive fiction.
• Planetfall, by Steve Meretzky of Infocom (1983), featured Floyd the robot, which Allen Varney claimed to be the first game character who evoked a strong emotional commitment from players.
• The Hitchhiker's Guide to the Galaxy, by Douglas Adams and Steve Meretzky of Infocom (1984), was notable in that the author of the original work was involved in the reinterpretation.
• A Mind Forever Voyaging, by Steve Meretzky of Infocom (1985), the first story-heavy, puzzle-light game.
• Amnesia, by Hugo Award and Nebula Award winning science fiction and fantasy author Thomas M. Disch (1987), the only purely text-only adventure ever published by Electronic Arts.
• Curses, by Graham Nelson (1993), the first game ever written in the Inform programming language. Considered one of the first "modern" games to meet the high standards set by Infocom's best titles.
• So Far, by Andrew Plotkin (1996), the first XYZZY Award for Best Game winner in 1996.
• Anchorhead, by Michael S. Gentry (1998) is a highly rated horror story inspired by H.P. Lovecraft's Cthulhu Mythos.
• Photopia, by Adam Cadre (1998), the first almost entirely puzzle-free game. Won the annual Interactive Fiction Competition in 1998.
• Varicella by Adam Cadre (1999). It won four XYZZY Awards in 1999 including the XYZZY Award for Best Game, and had a scholarly essay written about it.
• Galatea, by Emily Short (2000). Galatea is focused entirely on interaction with the animated statue of the same name. Galatea has one of the most complex interaction systems for a non-player character in an interactive fiction game. Adam Cadre called Galatea "the best NPC ever".
• Slouching Towards Bedlam, by Star C. Foster and Daniel Ravipinto (2003). Set in a steampunk setting, the game integrates meta-game functionality (saving, restoring, restarting) into the game world itself. The game won two XYZZY Awards and received the highest average score of any game in the Interactive Fiction Competition as of 2006.

Sample transcript

This is a brief transcript from one of many possible ways to not win the game Curses, by Graham Nelson. The player has entered instructions on the lines beginning with '>' (shown here in italic); the rest of the text is printed by the computer. The computer begins with a printed introduction giving a little context to the game (much more would become apparent as the game progressed):

It's become a matter of pride now not to give up. That tourist map of Paris must be up here somewhere in all this clutter, even if it has been five years since your last trip. And it's your own fault. It looks as if your great-grandfather was the last person to tidy up these lofts...

CURSES
An Interactive Diversion
Copyright (c) 1993 by Graham Nelson. New players should type "help".
Release 8 / Serial number 930603 (Compiled by Inform v634)

Attic

The attics, full of low beams and awkward angles, begin here in a relatively tidy area which extends north, south and east. The wooden floorboards seem fairly sound, just as well considering how heavy all these teachests are. But the old wiring went years ago, and there's no electric light.

A hinged trapdoor in the floor stands open, and light streams in from below.

>inventory
You are carrying:

a chocolate biscuit
an electric torch (providing light and closed)
a crumpled piece of paper

>read paper

Things to do:

1. Find map
2. Phone airport to check parking
3. Health forms...

and so on. Let's face it, 1. is more enticing than the rest put together.

>enter trapdoor
Yes, probably just as well to give up looking, and heaven knows there's enough packing to do, what with the rest of the family in uproar. Oh well.

*** You have missed the point entirely ***

In that game you scored 0 out of a possible 550, in 3 turns, giving you the rank of hapless Tourist.

Would you like to RESTART, RESTORE a saved game, give the FULL score for that game or QUIT?
>

Interactive fiction development systems

A number of systems are available today to write interactive fiction.

• ADRIFT
• Alan
• Inform
• Hugo
• Quest
• TADS
• T.A.G. (German)
• InformATE (Spanish)
• Superglús (Spanish)

The majority of recent IF development use Inform, TADS, or ADRIFT. In the 2006 IFComp, the entered games consisted of:

• Z-Code (Inform VM): 22
• ADRIFT: 5
• TADS 3: 3
• TADS 2: 2
• Web: 2
• Glulx (A second Inform VM): 1
• ALAN: 1
• HUGO: 1
• Quest: 1
• Java: 1
• Windows executable: 5

While familiarity with a programming language leads many new authors to attempt to produce their own complete IF application, most established IF authors recommend use of a specialised IF language, arguing that such systems allow authors to avoid the technicalities of producing a full featured parser, while allowing broad community support. The choice of authoring system usually depends on the author's desired balance of ease of use versus power, and the portability of the final product.

See also

• Choose Your Own Adventure
• Fighting Fantasy
• Roleplaying Games, which are occasionally described as another form of interactive fiction.
• Visual novel, interactive fiction with graphics.
• Graphic adventures, adventure games with roots in interactive fiction.
• Amateur adventure game
• Grue
• Interactive storytelling
• Gilsoft's The Quill and the Professional Adventure Writer
• Multi-User Dungeon (MUD), which may be considered as a kind of multiplayer or collaborative interactive fiction
• Addventure
• ifMUD

References

• Montfort, Nick (2005). Twisty Little Passages: An Approach to Interactive Fiction. The MIT Press. ISBN 978-0-262-63318-5.

External links

• The Interactive Fiction Archive (HTML), ditto (FTP) is a large archive of free-to-download and play interactive fiction.
  • Baf's Guide to the Interactive Fiction Archive presents a searchable index of games in the IF Archive
• The Interactive Fiction Wiki - A MediaWiki wiki specific to Interactive Fiction.
• Reviews
  • Brass Lantern - A web site dedicated to discussion and reviews of Interactive Fiction.
  • Interactive Fiction Ratings - Lists of the most popular games
  • Interactive Fiction Reviews Organization - A web site with lots of reviews of Interactive Fiction games.
  • IF-Review - A site dedicated to reviewing interactive fiction
• Newsletters
  • SPAG - Free online newsletter
  • XYZZYnews - Free online newsletter
• Competitions
  • Annual Interactive Fiction Competition - Annual competition for shorter works, typically works that can be completed in under two hours
  • Spring Thing - Annual competition for longer works
• Usenet news groups (if you have a news client):
  • rec.arts.int-fiction - Discussion of IF design
  • rec.games.int-fiction - Discussion of IF reading/playing
• History
  • Something about Interactive Fiction - MobyGames takes a look at the history (and future) of this classic gaming genre.
  • A Brief History of Interactive Fiction - A timeline of events in interactive fiction history at the Brass Lantern website.
• Interactive Fiction: More Than Retro Fun - A beginners introduction and setup guide to Interactive Fiction games and interpreters
• Cloak of Darkness - Roger Firth has collected implementations of the same simple piece of interactive fiction ("Cloak of Darkness") in over a dozen languages intended for writing IF, making it easy to compare the syntax and some of the features of many common IF development languages.