Among the multiple side missions in Double Fine’s 3D platformer Psychonauts 2 is the ‘Vent all the Psychoseismometers for Gisu’ mission. This side quest tasks Raz with finding three Psychoseismometer scattered throughout the hub areas. If collectathon mission structures are not your cup of tea then you are in luck! We have whipped our magnifying glasses out and scoured the lands to bring you this Psychonauts 2 Psychoseismometer guide! Be sure to also check out our other Psychonauts 2 guides for more side mission help.
Before embarking on the side mission, make sure that you are well prepared for combat. Venting each Psychoseismometer will start an arena challenge where you will have to defeat multiple enemies before proceeding. These are some of the more challenging combat moments of the game so preparation is key.
Starting the Mission
If you have not already got the side quest then you will need to head to the Quarry. To the side of the Motherlobe is a treehouse. Use rope trampoline, goat island, and logs to reach the base of the treehouse. From there simply follow the path up to reach Gisu and acquire the side mission.
To find the first Psychoseismometer head away from the treehouse and towards Psychoisolation Chamber. Head past the chamber and follow the signs for the Abandoned Mine to the right.
Alternatively, if you have already got the side mission and are not near the treehouse, head to the nearest quick travel location and warp to the Questionable Area. From here backtrack to the entrance of the Questionable Area within the Quarry.
Just below and to the right of the Questionable Area entrance is a small cave. Head through the platforming sections and navigate the waterfall of the cave to reach the Psychoseismometer.
For the second Psychoseismometer make your way back out of the cave and up through the Questionable Area entrance. If you are not in the cave then simply find the nearest quick travel location and warp to the Questionable Area.
Head into the Questionable Area and make your way slightly left. You will soon come across a sign that says ‘Campfire?’ and a climbable pole just off to the side of it. Head up the pole and onto the treetop platform above.
From the platform make your way across the branches and higher into the trees until you come across a gust of wind. Use your Levitation ability to ride the wind over to the Psychoseismometer.
The final Psychoseismometer is also located within the Questionable Area. From the location of Psychoseismometer Q33, head over to the opposite side of the area to the camp where the Aquato family have made themselves at home. Again, if you are not following this guide in order then warp to the Questionable Area and head to the right side of the map to find the Aquato camp.
Once at the camp head to the far right end, just beyond the camp is a small path that heads behind several trees. Follow this path beyond the trees to a blocked cave entrance.
Use your PSI Blast ability to destroy the rocks blocking the entrance. Head into the small cave you will find the final Psychoseismometer around a small corner.
Once you have found all three Psychoseismometers and completed the arena challenges within, head back to Gisu to complete the side mission and this Psychonauts 2 Psychoseismometer guide!