= advent(6) =
:doctype: manpage

== NAME ==
advent - Colossal Cave Adventure

== SYNOPSIS ==
*advent* [-l logfile] [-o] [-r savefile]

== DESCRIPTION ==
The original Colossal Cave Adventure from 1976-77 was the origin of all
later text adventures, dungeon-crawl (computer) games, and computer-hosted
roleplaying games.

This is the last version released by Crowther & Woods, its original
authors, in 1995.  It has been known as "adventure 2.5" and "430-point
adventure".  To learn more about the changes since the 350-point
original, type 'news' at the command prompt.

There is an 'adventure' in the BSD games package that is a C port by
Jim Gillogly of the 1976 ancestor of this game.  To avoid a name
collision, this game builds as 'advent', reflecting the fact that the
PDP-10 on which the game originally ran limited filenames to 6 characters.

This version is released as open source with the permission and
encouragement of the original authors.

Unlike the original, this version supports use of your arrow keys to edit
your command line in place.  Basic Emacs keystrokes are supported, and
your up/down arrows access a command history.

Otherwise, the "version" command is about the only way to tell you're not
running Don's original.

To exit the game, type Ctrl-D (EOF).

There have been no gameplay changes.

== OPTIONS ==

-l:: Log commands to specified file.

-r:: Restore game from specified file

-o:: Old-style.  Restores original interface, no prompt or line editing.
     Also ignores new-school one-letter commands l, x, g, z, i. Also
     case-smashes and truncates unrecognized text when echoed.

== BUGS ==

The binary save file format is fragile, dependent on your machine word
size and endianness, and unlikely to survive through version bumps. There
is a version check.

The input parser was the first attempt *ever* at natural-language
parsing in a game and has some known deficiencies.  While later text
adventures distinguished between transitive and intransitive verbs,
Adventure's grammar distinguishes only between motion and action
verbs. Motions are always immediate in their behavior, so both ACTION
MOTION and MOTION ACTION (and even MOTION NOUN and MOTION MOTION) are
invariably equivalent to MOTION (thus GO NORTH means NORTH and JUMP
DOWN means JUMP). Whereas, with actions and nouns, the parser collects
words until it's seen one of each, and then dispatches; if it reaches
the end of the command without seeing a noun, it'll dispatch an
"intransitive" action. This makes ACTION1 ACTION2 equivalent to
ACTION2 (thus TAKE INVENTORY means INVENTORY), and NOUN ACTION
equivalent to ACTION NOUN.

Thus you get anomalies like "eat building" interpreted as a command
to move to the building. These should not be reported as bugs; instead,
consider them historical curiosities.

== REPORTING BUGS ==
Report bugs to Eric S. Raymond <esr@thyrsus.com>.  The project page is
at http://catb.org/~esr/open-adventure

== SEE ALSO ==
wumpus(6), adventure(6), zork(6), rogue(6), nethack(6).
