Psychonauts 2 is a fairly compact game if you only focus on blitzing through its main story, but there are a handful of optional activities and hidden secrets for you to uncover as well. An early ...

Find all three Psychoseismometers in Psychonauts 2. Once you’ve unlocked the Quarry and the Questionable Area in Psychonauts 2, you can return to the intern’s secret treehouse and get a tricky job ...

To start the optional side mission, Vent All the Psychoseismometers for Gisu, head to the fast travel location of the Quarry, and look for the large Treehouse that you can spot towards the left side ...