Unlockables
Complete the indicated challenge to unlock the corresponding bonus.
Unlock Underworld Track:
Complete Challenge 2.
Unlock Glacier Track:
Complete Challenge 11.
Unlock Sewer Pipe Arena:
Complete Challenge 5.
Unlock Crankshaft Docks:
Complete Challenge 8.
Unlock Treadwell Plaza:
Complete Challenge 14.
Unlock Underworld Arena:
Complete Challenge 17.
Unlock Sho-Stopper vehicle:
Complete Challenge 6.
Unlock Surf Crate vehicle:
Complete Challenge 12.
Unlock Krazy 8s vehicle:
Complete Challenge 18.
Unlock HW Prototype Vehicle:
Complete ALL missions in Adventure mode.
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