Deus Ex design document version 13.12

Deus Ex design document version 13.12 is a prerelease concept document for the game Deus Ex. The document is dated 1999. The exact date of the document is unspecified, but its contents suggest a date in November of that year. The design document is 242 pages long and includes comprehensive information on all aspects of the game-in-development. Parts of its story-related content were later incorporated into the Deus Ex Bible.

Development history
Design document version 13.12 reflects the state of the game sometime between the completion of the second alpha build (which was completed in April 1999) and the completion of the first beta build. By this time, the White House and the Mount Weather missions have already been cut from the game, as they are not included in the missions list.

Missions list
The design document includes detailed descriptions for 13 missions, numbered 01–06, 08–12 and 14–15. This set of 13 missions was carried through to the finished game. Mission 07 and 13 are specifically described in the document with the label "does not exist." Presumably, these numbers were used for previous missions that were cut or merged into another mission.

The design document also provides names for the 13 missions. However, these mission names were not carried over into the final game, which does include names for any of the in-game missions. The mission names in the design document also differ from the mission names used in Deus Ex: Prima's Official Strategy Guide.