There are a total of 3 Riddles located in the Arkham Knight HQ and they can be found in the following locations:

Riddle 01

This riddle is located within the Killinger’s building at the Arkham Knight HQ (North) location on the world map.

“With a fluffy white coat and ears standing tall, what burrowed the hole in which Alice did fall?”

Glide over to the ledge on the southern side of the fan shaft between the two fans. Grapple up to the ledge here to reach the first elevator, take it the bottom. As soon as you exit the elevator shaft into the next hallway, scan the rabbit mannequins in the window ahead to solve the Riddle.

Riddle 02

This riddle is located within the Arkham Knight boss fight area at the Arkham Knight HQ (South) location on the world map.

“A psychotic doctor who caught the fear bug, the fruits of his research a powerful drug.”

In the southern room of the Arkham Knight boss battle area. In the middle of the western wall on the lower level, you will be able to look through one of the shopfront windows to see a store filled with yellow gas. Scan this to solve the Riddle.

Riddle 03

This riddle is located within the Arkham Knight boss fight area at the Arkham Knight HQ (South) location on the world map.

“Vengeance burns darkly inside the betrayed, as they stare at reminders of debts unpaid.”

In the western room of the Arkham Knight boss battle area. Along the left hand wall on the lower level, you will see a stack of ammo crates bearing the Arkham Knight logo. Just beside these is a small pin board with lots of photos adorning it. Scan the pin board to solve the Riddle.