Psychonauts 2 Quarry Supply Chest Keys are required not only to open the Supply Chests in the Motherlobe Quarry but all Supply Chests in the video game developed by Double Fine Productions. Therefore, finding them as soon as possible is mandatory, as you’ll be able to unlock the Chests you encounter while exploring the world.
Since these items can become problematic (just like some Motherlobe Keys), throughout the guide below, we’ll discuss where to find all 4 Supply Chest Keys in the Psychonauts 2 Motherlobe Quarry area.
Before we move to the actual locations of these keys, it’s worth pointing out that these are similar to other collectibles in the game, meaning that you won’t be able to get all of them without unlocking specific badges and upgrades for Raz.
As such, unless otherwise stated in the guide below, you can acquire these the moment you reach Motherlobe Quarry for the first time. Last but not least, the guide comes with the map locations, so you should use those along with your in-game map to find all keys faster.
Quarry Supply Chest Key #1
Map Location: A (Motherlobe Exit)
When you exit Motherlobe, turn left and use the airstream to Levitate to the balcony, then search behind the building.

Quarry Supply Chest Key #2
Map Location: C (Research & Development)
While facing the Research & Development building, head right and look behind the building. It’s sitting on a rock.

Quarry Supply Chest Key #3
Map Location: C (Research & Development)
Inside Otto’s Laboratory, behind his desk, there is a large ventilator. Slow it down using the Time Bubble power unlocked by playing the PSI King’s Sensorium.

Quarry Supply Chest Key #4
Map Location: B (Psychoisolation Chamber)
Behind the Psychoisolation Chamber, close to the mountain wall, is a box surrounded by a fence. Use the Wrecking Levitation Ball to get to the platform facing the key, then glide on the box.

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