Psychonauts 2's story picks up only a few days after the events of the first game which means that most of the original Psychonauts' main cast returns for the sequel, including the mad, but brilliant Ford Cruller. Unfortunately, when forced to return to the Motherlobe in the early hours of the game, Cruller splits his personality into three pieces that Raz has to go and collect. The player has the option to pick up the pieces in whatever order they like as they've been spread to the bowling alley, the hair salon, and the mailroom.
Because the mailroom is already a familiar location to Raz at that point in the game, many players tried their luck there first only to discover that to proceed, they need to find a new brain for their mentor Nick Johnsmith. As "Repair Ford's Shattered Mind" is part of Psychonauts 2's main story, finding a replacement brain for Nick is integral for moving the story forward.
How to Get a Spair Brain for Nick
As it turns out, getting a new brain for Nick is pretty straightforward. As the quest tab in Raz's journal says, Otto Mentallis might have a spair that the player can borrow, so it'd be a good idea to head towards his lab and pay him a visit. Thanks to Truman Zanotto, at this point in the game Raz is finally able to open all doors and access the entirety of the Motherlobe as well as explore the surrounding area.
Otto's lab isn't actually connected to Psychonauts HQ, instead, it's across the lot from it in its own separate building. To find it, Raz needs to leave HQ by going to the lobby which can be found in the center of the Motherlobe's main area. After leaving through the front doors, keep heading straight and find the arrow on the ground of the parking lot pointing towards Otto's Lab. There's plenty of other people to see outside like Lili and Frazie, but to find Nick's new brain as soon as possible, head straight across the lot to the lake. From there, platforms should emerge out of the water for Raz to jump on and across to get to the parking lot on the other side.
Enter the building and talk with Otto, he'll give Raz a few new items and answer any questions about the suspected mole in the Psychonauts. Weirdly enough, Raz doesn't have a dialogue option to ask about finding Nick a brain, so the player needs to jump over the counter and grab a brain for themself. Head straight back behind Otto and enter the giant brain-machine. Select "unprocessed minds" in the menu and then select Heptadome Harry at the bottom of the list. After a brief cutscene, Raz will pocket the brain and the player will need to head back to Nick in the mailroom. Once Raz reaches him, he'll give Nick the brain and enter it, completing the quest.
Psychonauts 2 is available on PC, PS4, Xbox One, and Xbox Series X/S.