Proto:Gran Turismo (PlayStation)

Test Drive disc
The Test Drive build of Gran Turismo was distributed as the second disc of Pule Pule Volume 8, a series of PlayStation demo discs in Japan.

General differences

 * There are billboards with a single checkered pattern logo with the text that reads "GRAN TURISMO" and "DRIVING SIMULATION GAME" above the logo scattered around the circuits in this demo. Some of them can still be seen in the Arcade Mode track previews (for certain courses only) and in the main title screen.
 * High Speed Ring was originally set in the dusk, and the grandstands at the straight after turn one were just walls. The dusk skybox was used in License Tests B-6 and B-7 in the final version, although some overhead advertisements were removed to obscure this fact.
 * Effects when the player's car point of view was changed during the race were cut from the final version.
 * One of the tunnels in Grand Valley Speedway were originally slightly longer. Also, a Honda billboard in a turn after the last tunnel were removed from the final version. The East layout also had less tyre walls. Additionally, a building in the final corner was missing in the Test Drive disc.
 * Autumn Ring Mini had originally more trees.
 * Some circuits had less billboards compared to the final version.
 * The home straight in the Test Course had the meter markers positioned differently. Also, the road-pit road seperator were made from concrete rather than grass.
 * In Special Stage Route 5, there are trees instead of fences in the section after the tunnel.
 * The underpass chicane in Special Stage Route 11 had different chicane barriers in the Test Drive version. More construction buildings existed in this version, too.
 * Trial Mountain's starting grid were originally slightly tilted, proably an coding error.
 * Several racing modifications and racing cars had different designs. Of the greatest concern was that the racing modifications of Nissan Pulsar GTi-R, 1996 Honda Civic 3-door, and Toyota Celica SS-II, all had a Rothmans logo (as well as Olivetti, a brand of calculators and computer equipment, in the Celica and Civic and Lancia, a car manufacturer that evantually appears in Gran Turismo 2, in the Pulsar and Civic) in their car. These logos were all removed and the racing modifications were redesigned due to licensing issues and to avoid controversy of advertising tobacco products in a video game (related to the Rothmans logos, after the legal incidents of Final Lap and Super Monaco GP years ago), except for the Celica SS-II in which both Olivetti and Rothmans writings were made less legible in the final version. The Special Model NSX, Impreza, and GTO/3000GT was also different, and the Impreza racing modifications looked more closer to the real WRC version, and to tip it off, it has Repsol logos, which was made less legible in the final.
 * Some other cars appeared cruder and had different rims, not to mention having different color choices.
 * Due to an error, the Griffith Blackpool B340 is listed as 4WD in this demo.
 * Car dealerships appeared different. Both New, Used, and Special Model showrooms all use a list.
 * There was neither Machine Test or License in the GT mode menu.
 * There was no background picture in the arcade mode.