This page of the guide to Psychonauts 2 contains all the Half-A-Minds available in Hollis' Hot Streak.
you’ve got the option to find 4 Half-A-Minds in this level.
First Half-A-Mind
Location: Shattered Classroom.
This secret can be found immediately after entering Hollis' mind.
Second Half-A-Mind
You’ll find this secret immediately after entering the mind.
you better reach the black platform, right below “RISK”.
This secret can be found on a moving platform, right after the wall which lets you progress further.
Do not progress, however.
Jump onto the octopus chip, then onto a glowing die.
There you’ll find the Half-A-Mind.
The Half-A-Mind is right next to the passageway, on the bar couch.
You’ll reach it with a double jump.
