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atworldsend (alltrackGP,)
tollwayhead2head
(fortmagma)
islandfollow
(atworldsendGP)
tollway time
(canyon)
city time
(snowtuxpeak)
moon and back
(snagdriveGP)
jungle follow
(city)
energy shiftingsand
(moonandbackGP)
racetrack time
(jungle)
energy mathclass
(crescentcrossing)
penguin playground
(followtheleader)
Necessary dependency (e.g. track must be unlocked
before a GP using this track can be unlocked)
Artifical dependency to restrict number of challenges
(and perhaps to sort them by difficulty)
snowmountain (Gnu)