->''The place is deep, dark, and mysterious. This is wrong. All wrong. It wasn't supposed to be like this.''

->''But you have no choice now, do you? No choice but the staircase in front of you.''

[[http://addventure.com/addventure/ Addventure]] is a collaborative RoundRobin ChooseYourOwnAdventure website. It started life in 1988 as a BBS program by Allen S. Firstenberg and was ported to the Web in 1994. It has been inactive since 2000, but strangely has managed to stay online. [[note]]And they've recently created a Google+ profile and linked to it on the site, so evidently the authors still take care of the place.[[/note]]

The website hosts three adventures, each of which begin with a protagonist [[OntologicalMystery finding themselves in a strange place]]. In RoundRobin fashion, the story then branches out into paragraphs written collectively by Internet users. The original intention was to see what kind of a story would come out of this. We'll spoil it for you: the results are [[WorldOfChaos utter]] [[WhatDoYouMeanItWasntMadeOnDrugs madness]].

It is currently not possible to add new pages, and most likely it will never be.

!!This work contains examples of the following tropes:
* ChooseYourOwnAdventure
* OntologicalMystery: Starting point of all the addventures.
* {{Portmantitle}}: "add" + "adventure"
* RoundRobin
* RunningGag: Every of the three available games begins with the protagonist standing before a staircase and having to decide whether to go up or down.
* SturgeonsLaw: In general, the farther a page is from the start, the more incoherent it is.
* WorldOfChaos: Pretty much every adventures degenerates into madness within the first few pages.