6) “Hope shines brightly in a city this dark, find the source of that signal and you’ll soon hit your mark.”
Scan the Bat Signal at the top of the GCPD building on the south of the map.
7) “Always looking for names to besmirch, where does this newsman conduct his research?”
When inside GCPD (you usually enter when dropping a criminal off), head over to the interview room and scan Jack Ryder along with his desk.
8) “Joining your mission can come with a cost, this empty reminder shows just what she lost.”
You’ll need the Remote Hacking Device for this one. Head to the clock tower and enter Barbara Gordon’s room. Look for the terminal and unlock it to reveal her Batgirl costume. Scan it.
9) “A souvenir from a previous life, why hold with a hand when a hook will suffice?”
In the GCPD building Aaron Cash is manning the front desk. Head behind and scan his desk.
10) “A bat uses these to see at night, the doc’s didn’t work and his cure caused a fright.”
When inside Kirk Langstrom’s lab, scan the drawing on the wall. If you are unsure where it is, just wait for the second part of the Creature of the Night side mission. You will have to go there then.
11) “Business is best when Bats need killing, a mercenary’s life should receive top billing.”
Head to the top-left section of the GCPD Lockup (the comms room) and scan the picture on the wall.
There you have it, all of Mr. Nigma’s riddles tied up in a neat little bow for you. Listen as he grows enraged at your superior intellect. The world of Batman: Arkham Knight is now a less confusing place.