Finish all the Go-Kart races.
To begin the Go-Kart series of races, you can go to the ticket booth at the
Go-Kart track anytime after Chapter II is unlocked.
Source: EWaechter's FAQ
You have to beat all of the 10 go-kart race, 5 at the carnival and 5 in the streets.
Walkthroughs & FAQs
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