There are 440 Riddler collectibles in Batman: Arkham City. They are part of the game's much larger collection of Riddler challenges, which blend trophies, riddles, destructible objects, and hostage-related puzzles across the city.
The total includes collectibles assigned to both Batman and Catwoman. That distinction causes frequent confusion: guides often describe 400 challenges for Batman and 40 for Catwoman, while the overall completion total is 440. The Catwoman content is tied to the game's playable Catwoman sections and downloadable content structure.
Collecting them is not merely a completionist exercise. Solving enough challenges unlocks access to Riddler's hideout and progresses the hostage-rescue storyline. Players also need different gadgets and abilities, such as the Cryptographic Sequencer, explosive gel, and remote-controlled devices, so many collectibles must be revisited later. The figure is therefore larger than the number of visible green trophies alone.