The main advantage for me is to contribute to the travel of these objects; I'm from France.
beyond the game, when you discover the travelers objects with project-gc in the "Tools"tab, this marks the point of PSG ... and in this same tab, there are all actions "rescue TB"that will make you also earn points also for badges and belts ...
there are also some challenge that demands discovering a number of TB to fill the right conditions; therefore the advantage to discover is to apply for mysteris also challenge
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