The Journeyman Project 3 - Legacy Of Time

Hidden secrets:
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Hold E and click at the following parts of the 
game to view hidden secrets.

Start: Click on the suit's faceplate. 

Shangri-la: When one screen away from the pilgrim, click 
towards the pilgrim. Then, after you move, look left to see 
a can of Mountain Dew on the white ornament. 

El Dorado: Go back to the central temple after you have been 
decked down the shaft by Khan in Shangri-La. 
Click the ventilation shaft's zoom magnifier to see the center 
of the earth. 

Eldorado: Click while walking toward the Shaman's house. 
A cat will appear on the side of the balloon.