Photopia is a piece of literature by Adam Cadre rendered in the form of interactive fiction, and written in Inform. It is regarded as a pioneer in narrative-driven, rather than puzzle- or challenge-driven, interactive fiction, and is perhaps the most successful example of this genre to date. It won first place in the 1998 Interactive Fiction Competition.
Photopia has few puzzles and a linear structure, allowing the player no way to alter the eventual conclusion but maintaining the illusion of non-linearity. This gives horrendous and deeply felt weight to some of the story's motifs -- questions of free will and determinism. Photopia is thus effective in part because it subverts the expectation that one has upon encountering a piece of interactive fiction: that one's actions will have consequences.
Cadre, Adam :: Authors
Z Machine :: Interpreters
Freeware :: Video Games

AdamCadre.ac: Games - Author's website. Download Photopia in Z-machine or PC executable format, play it online using Java, or read about the making of the game.
Baf's Guide to the IF Archive: Photopia - Rated 5/5 by Carl Muckenhoupt. This is probably the most successful example I've seen of interactivity at the service of fiction, rather than vice versa. Links to play online, downloads, walkthrough.
Review by Andrew Plotkin - Review of 1998 Interactive Fiction Competition entry. Three kow-tows and a bout of swearing.
SPAG Reviews - Reviews by Paul O'Brian, Duncan Stevens, Brian Blackwell, and David Ledgard.
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