Riddles Zsasz Hideout. There is also a second trophy is Zsasz's hideout, to the right, around the corner from the floating bridge in front of the trophy cage you need to short out. The Riddle concerns The Broker, and is answered by scanning a pile of cards on Zsasz' desk, once you defeat him.
This riddler trophy is on the wall inside Zsasz's hideout – To collect it, create an ice platform and get the trophy with Batclaw. Batman: Arkham City builds upon the intense, atmospheric foundation of Batman: Arkham Asylum, sending players soaring into Arkham City, the new maximum security home for all of Gotham City's thugs. This will create an electric arc nearby.
Zsasz's Hideout in the Industrial District Zsasz is all caged up and I've freed the hostages and I've cleared the area of Riddles and Riddler's Trophies.
The other room with the answer being two or whatever with the riddle being what number comes after three when the knight falls.
Originating as the main hitman for Carmine Falcone, Zsasz has joined ranks with Oswald Cobblepot after Falcone's fall from power. Amongst others, Zsasz is present when Penguin vows revenge on the Red Hood Gang. Use a frreeze grenade to make a floating platform to help you see around the corner, the trophy is on the wall.