slow the player down. There is a time limit, which ends the race if counted down to zero. A single course is featured comprising four configurations of increasing difficulty: Novice, Intermediate, Advanced and Time Trial (the latter two are extended). The player races eleven opponents except in Time Trial, where there is only one. The greater the difficulty, the faster the cars run; Time Trial is the fastest. Each race consists of three laps (two on the beginner course). Checkpoints that grant additional time when passed through are present throughout. In the PlayStation version, after every race is won, reversed ones become available, and an additional opponent is encountered in Time Trial: the 13th Racing (also known as the "Devil" car), the fastest car. On winning, the car is unlocked. The PlayStation version features a hidden "mirror" version of the tracks. It becomes a "mirror image" of itself; left turns become right turns and vice versa, and the surroundings switch sides of the road. In the arcade version, the winning player's score is saved in action-replay highlights after finishing the game. In the PlayStation version, a mini-game of Galaxian can be played as the game loads. If won, eight additional cars become available. Once the game has loaded, the CD is only needed to play six music tracks. The disc can be replaced during gameplay, although the game does not update; regardless of what disc is inserted, there will always be six tracks, corresponding to the starting points of the tracks on the game disc. Development and release At the Japan Amusement Machinery Manufacturers Association (JAMMA) 1992 Amusement Machine Show (AM Show) in Japan, held during 17–19 August, Namco debuted a racing game called Sim Drive for the Namco System 22 arcade system board. It was a sequel to Eunos Roadster Driving Simulator, a Mazda MX-5 driving simulation arcade game that Namco developed with Mazda and released in 1990. Its 3D polygon graphics stood out for the use of Gouraud shading and texture mapping. After a location test at the show, where it was previewed in the November issue of Electronic Gaming Monthly, Sim Drive had a limited Japanese release in December 1992, but did not get a mass-market release. It served as a prototype for Ridge Racer. Ridge Racer had a development cycle of eight months. The development team was under pressure to complete it before their rivals, and