Unlock Corkscrew:
Complete all of Terk's challenges for the third world to get Corkscrew.
Unlock Ground Tumble:
Complete all of Terk's challenges for the first world to get ground tumble.
Unlock Scarecrow:
Complete all of Terk's challenges for the second world to get Scarecrow.
Unlock Terk:
Complete the three Terk challenges at the end of the game to unlock Terk.
Unlock Jane:
Beat all of the Terk challenges in World 1 to unlock Jane for waterskiing and river-surfing challenges.
Unlock Porter:
Beat all of the Terk challenges in World 2 to unlock Porter for waterskiing and river-surfing challenges.
Unlock Tarzan movie:
Accumulate all 75 film reels
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ALL Gamecube cheats
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