On IGN there is a page dedicated to the canceled original concept for the game Monster Knight from Insomniac. The design bible can be found on the second page.
The Monster Island Pitch from Irrational Games
Irrational Games has a web page devoted to the unfinished The Monster Island game. A pitch document for this game was written by Ken Levine and it can be seen in the “From the Vaults” section.
Shred Nebula Pitch and Gameplay Documents
A couple of years ago CrunchTime Games Inc shared the Pitch Document and 60 Seconds Of Gameplay Document for their XBLA game Shred Nebula. These documents can still be found on their website.
According to the author James Goddard: “What makes these documents special is the way they are created, using a technique I call “Visual Game Design” that I was fortunate enough to adapt over the years, reflecting on experiences of working with the Japanese early in my career.”
Development journals Prince of Persia and Karateka
On the website of Jordan Mechner two samples of his journals can be found about the creation of Prince of Persia and Karateka. The complete journals can be bought from his website, but these samples already give a glimpse into developing these games.
At the bottom of this page the source code for the original, Apple II Prince of Persia and an explanatory technical document can be found.
Grim Fandango Puzzle Document
The Grim Fandango Puzzle Document is the game’s initial pitch document written by Tim Schafer. The manual and original music score are also available.
The Doom Bible
The Doom Bible is the original design document for Doom, written by Tom Hall in 1992. Not much from this document was used in the original game, but it’s an interesting read.
Classic LucasArts Game Design Documents
Aric Wilmunder has released many of the original LucasArts Game Design Documents on his personal website. He is still busy adding new documents, but the following files can be seen on his website at this moment:
- Monkey Island
- Day of the Tentacle
- Maniac Mansion
- Star Wars Rebel Assault
- Shadows of the Empire
- Defenders of Dynamo City
- The Telecommuter
- Labyrinth
- Indiana Jones and the Last Crusade
- Sam & Max
- The Dig
- Curse of Monkey Island.
EDIT: Aric Wilmunder’s website seems to be offline, luckily the Internet Archive made a snapshot of the page with the game design documents
WipEout Game Design Document
For the 20-year anniversary of WipEout (PS1) the game designer Nick Burcombe, who worked at UK developer Psygnosis, has released the official Game Design Document.
Saints Row Undercover GDD and walkthrough
Deep Silver Volition has uploaded the Game Design Document and walkthrough for the unreleased Saints Row Undercover PSP game.
Monaco Game Design Document
The developer for Monaco has released the original game design document on Facebook.