How to Increase your Intern Rank
The easiest way in which you can increase your Intern Rank in Psychonauts 2 is by searching the free-roam locations for PSI Challenge Markers, which will give you an entire Intern Rank. You can also craft PSI Challenge Markers by purchasing PSI Challenge Marker Core from an Otto-matic shop and then combining it at the shop with 9 PSI Challenge Cards.
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