Let's Face It, There Are Two Dents on the Wall
Head to the guard house on the western ground floor of Arkham North. Blow the fuse to enter. Scan the posters on the wall and desk to solve the riddle. The posters read "Vote Dent," as in Harvey Dent, A.K.A. Two Face.
What Time Is Tea Time in Wonderland?
Go to the Botanical Gardens and then onto the second floor of the circular greenhouse. Walk around to the back of the statue and look between the trees. Scan the tea set there, which resembles the Mad Hatter's tea set from "Alice's Adventures in Wonderland."
Hook Up With The Relatives Before You're Transferred Out of Here
Pass through the eastern side security gate of Cell Block Transfer in the Intensive Treatment section and walk up the stairs. Look on the desk and scan the portrait of Aaron Cash and his family. Cash is the guard with a hook instead of a hand.
The Legacy of This Island Has Been Well and Truly Buried
Walk around the cemetery in Arkham East until you find an open grave. Scan the grave and the headstone next to it to answer the riddle. This is the final resting place of Amadeus Arkham, the founder of Arkham Asylum.
"Did Amadeus Go Mad, or Was He Just Dizzy?
Walk down the north corridor in Arkham Mansion and look in the jail cells until you find one with writing spirals on the wall. On closer inspection you will discover that this is actually writing. Scan the spiral writing to solve the riddle.
What Silent Killer of The Oceans Can Be Found in a Tiny Jar?
The answer to this riddle lies in the morgue in the Medical Facility. Find the glass jar next to the autopsy tables and zoom in to see it contains the ears and nose of the villain known as The Great White Shark. Scan the jar.