Now an abandoned factory, the Riddler has turned the building's lower floors into his own secret hideout; rigging the upper floors with tricks and puzzles to deter visitors. Having been leaving clues for Batman to find; claiming that he knows who was behind Joker's latest chemical formula. Learning that Joker had hired Deathstroke to kill Riddler before he revealed his secret, Batman sends a new hero to the hideout to get to Riddler before Deathstroke does.