Skimmer Race with Sierra - Complete both skimmer (the hover jet) levels.
Are you referring to the customs clearance Whon and Ceprainus? Then you can unlock it? So where can I play it? Enter the code in the spaceship or a new planet?
Yes, complete both and a new world Tasemonia opens up. Its purple. The race is what inspired my Krazy Keet Racers.
