Mute, Vol 1, No. 22 ("The Art Issue"), including CD-ROM of JODI, Untitled Game (1996-2001).
Rhizome's erstwhile Conservation Fellow, Lisa Adang, has published the results of her material analysis of JODI's Untitled Game (1996-2001), and her findings are both more concrete and more nuanced than much of the extant scholarship.
By way of background, Adang points out that JODI began working with game "modding" around the same time as they began working with the web.
Although they may be best known for their web browser-based works, in this early period, JODI also experimented with the alteration of game code using two hugely popular computer game sources: Wolfenstein 3D (1993) and Quake 1 (1996), both developed by John D. Carmack, John Romero and the team at Id Software based in Richardson, Texas. Wolfenstein is widely recognized as the first fully rendered three-dimensional polygon game environment, a technique that allows objects and walls to appear to wrap around the player's perspective, realistically block the player’s sightline, and recede into a vanishing point that shifts with the main character/player's perspective. Characters within the game are also comprised of polygons, and sprite images occur on instances such as the firing of a weapon, scaling to suggest proximity and perspective.