AutoDuel is the official adaptation of the Car Wars board game: a United States where the highways fell into the hands of motorized gangs and vehicular dueling is the national sport. Origin Systems, the house behind Ultima, published it in 1985.
You build your car piece by piece -engine, armor, weapons- and head out to trade, escort or hunt outlaws between cities. Half RPG, half garage workshop: few titles of the era let you customize so much as a single screw.
This system doesn't run in the browser yet (Dreamcast, GameCube, PS2 and Xbox are on the way as web emulation matures). The dossier, media and community are already all yours.

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