* GreenHillZone: Joyride, from the first game.
** The second game is a unique case. All of the AI racers are based on different developer runs of each track. The different difficulty levels simply change the speed of the racers. Pro difficulty has most AI racers reaching above the top speeds of players. Insane difficulty is almost literally impossible without the the normally [[GameBreaker game breaking]] bonus character, Enigma.
** Amateur, Intermediate, Professional, Master, and Insane (only in ''Jet Moto 2'').
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