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This game is titled Up in North America, Europe, and Australia and Carl Jii-San no Soratobu Ie in Japan.
Backflip on vines
Get to a part where you are on one vine and have to swing to another one. Go on the second vine. Instead of going forward, press A when you are going backwards. You should be rubbing against the vine behind you. Once you get to the bottom of the vine, he will do a backflip then hold onto the vine. Note: this will only work with the old man, Carl.