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On the side of the girl of the construction there is a cave that is not seen by the trees, after leaving it you will look for a box to drag it to where the others are and you can climb.

Sorry if you don't understand it well, I'm using a translator.

Versión nuevas /New version 

de esa maneras yegas para recoger la llave / that's how he came to pick up the key

Versión vieja /old version

de esa manera puedes recoger la llaves / that way you can collect the keys