International Circuit for Make Benefit Glorious Nation of Kazakhstan
Originally designed by /u/competentidiot on reddit.com/r/racetrackdesigns
Tilkedrome
Designed for maximum racing inefficiency and confusion.
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Ocean Valley Circuit
A moderate speed course that runs close to the sea of Andalusia.
Johnny Park
A tight and challenging course by the sea.
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Notburgring GP/F
Originally from reddit.com/r/racetrackdesigns by /u/