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Massively multi-player online racing video games (often abbreviated MMOR) are video games with an explicit focus on racing that involve persistent changes to the in-game world driven by player interaction.
Currently there are only a small number of racing based MMOs, including Kart Rider, Upshift StrikeRacer, Test Drive Unlimited, Project Torque, Drift City, Exalight and the upcoming Need for Speed: World Online. The Trackmania series is the worlds largest MMO racing game and holds the world record for "Most Players in a Single Online Race". Although Darkwind: War on Wheels is more combat based than racing, it is also considered an MMOR.