Hobbies And Interests
First World
Although it's not necessary to complete all of Terk's challenges in the first world to progress to the second, doing so will unlock both a new character and a new move. It will unlock Jane as a playable character, but only for the waterskiing and river-surfing stages. Completing all of the challenges will also unlock the "ground tumble" move for use by Tarzan in any of the stages.
Second World
Just like in the first world of "Tarzan: Untamed," the key to unlocking more secrets in the second world is in the completion of every last one of Terk's challenges. Completing all of these tasks will unlock two playable characters -- the porter and the scarecrow -- for the river-surfing and waterskiing stages.
Third World
Complete all of Terk's challenges in the third world to unlock Tarzan's "corkscrew" ability. Three stages at the very end of the game offer additional challenges. Successfully completing all of these final tasks will unlock Terk himself as a playable character for all of the game's levels. You can even start a new game and play through the whole adventure again as Terk.
Hidden Movie
The game's "exploration" stages -- that is, those in which Tarzan isn't sliding down trees but walking around discovering new paths --have a total of 75 film reels hidden throughout them. Some of the reels are in plain sight and are easy to collect by walking into them. Others are hidden away at the end of branching paths. The key to finding all 75 is to go back through each stage and carefully explore all alternate routes. Once you've collected all 75 reels all, you will unlock a hidden "Tarzan" movie viewable from the main menu.