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Rad Mobile (ラッドモビール) is an arcade racing simulation game developed by Sega AM3 for the Sega System 32. The first game released for the hardware in February 1991, it is also notable for its cameo inclusion of Sonic the Hedgehog, technically making it the character's first ever appearance in a video game.
Rad Mobile deviates slightly from the style of Sega's previous arcade racers; it aims to provide more elements of simulation, using a first-person perspective instead of third. Recurring traffic, police, and primitive weather effects act as obstacles, the latter of which are negated with the use of in-game windscreen wipers and headlights. 14 CPU cars also race as opponents, with players receiving different ending scenarios depending on their rank at the end of the game.
Regardless of its sim-like features, a time limit and only two selectable gears are still used in Rad Mobile, grounding it in the arcade subgenre of racing games. Like OutRun, stages take place across the USA, with the goal being to reach the final destination, New York, before the time limit runs out. This is achieved by avoiding collisions with oncoming obstacles and reaching stage checkpoints, which provide time extensions.
Stage 1: Los Angeles - Day
Stage 2: Mojave Desert - Day
Stage 3: Las Vegas - Night
Stage 4: Provo - Rain
Stage 5: Salt Lake City - Day
Stage 6: Rocky Mountains - Day
Stage 7: Cheyenne -Thunder Storm
Stage 8: Lincoln - Night
Stage 9: Omaha - Day
Stage 10: Kansas City - Fog
Stage 11: St. Louis - Night
Stage 12: Springfield - Rain
Stage 13: Chicago - Day
Stage 14: Indianapolis - Night
Stage 15: Cincinnati - Day
Stage 16: Columbus - Dusk
Stage 17: Pittsburgh - Night
Stage 18: Washington, D.C. - Fog
Stage 19: Philadelphia - Day
Stage 20: New York - Day
Some stages, such as Springfield, have multiple routes.
Initially released to the world in the upright and Taikan cabinets typical of a release of its type by that point in February 1991, Rad Mobile would receive two new versions in the following months; Rad Rally, a revised edition that implements stage selection and multiplayer link features, and a limited release for adapted R360 units in Japan.
Rad Mobile was later updated and released as Gale Racer for the Sega Saturn in December 1994. This version makes a few changes, and was not released outside of Japan.