You can learn more about the Arkham Asylum patients that Batman is fighting by listening to their interview tapes.
Among the many types of collectibles in Batman: Arkham Asylum are the Patient Interview Tapes. These, if not obvious, are recordings of the inmates that give a better understanding of their psychotic tendencies.
There are a total of 35 interview tapes for you to find across all seven locations on the map. These are broken down into five recordings for seven different villains: the Joker, Harley Quinn, the Scarecrow, Poison Ivy, the Riddler, Killer Croc, and Victor Zsasz.
Do note that some tapes require you to unlock a certain gadget or upgrade. We have mentioned the requirements below but you will have a much easier time if you start searching for the recordings after beating the main storyline. Arkham Island (The Joker’s Tapes)
Interview Tape #1
Requirements: Cryptographic Sequencer
Head to the guard room in Arkham North and use your Cryptographic Sequencer to interact with the panel and override the security barrier. The patient interview tape will be located on the desk near a closed book.
Interview Tape #2
Requirements: None
This tape is located in the western guard tower in Arkham North. Simply head to the table with the flickering TV and retrieve it.
Interview Tape #3
Requirements: Cryptographic Scanner
This patient interview tape is located in the guard room above the passage. It can be accessed by grappling towards it from the ground.
Use your Cryptographic Sequencer to interact with the panel and override the security barrier. It will be located on the table in the leftmost cell.
Interview Tape #4
Requirements: None
Head to the southern guard tower in Arkham East. Grapple up to it and retrieve the tape; it will be lying on the table.
Interview Tape #5
Requirements: None
The last patient interview tape can be retrieved at Pier Shed in Arkham West. It will be lying on top of a box inside the shack.Intensive Treatment (Harley Quinn’s Tapes)
Interview Tape #6
Requirements: None
Head to the lobby of the intensive treatment; you will find the tape on a desk inside the office.
Interview Tape #7
Requirements: Cryptographic Sequencer with range amplifier
Head to the cell block transfer office to find the 8th patient interview tape of Batman: Arkham Asylum. Use the cryptographic sequencer to disable the security system and head up the stairs. The tape will be lying on the computer terminal.
Interview Tape #8
Requirements: None
After going down the elevator shaft, this tape will be in the secure transit control room. It will be on a desk behind an already disabled electric barrier.
