Batman: Arkham City - 10 Coolest Easter Eggs, Secrets And References Explained

8. The Calendar Man Easter Egg That Took YEARS To Find

Calendar Man is one of the more underrated Batman villains. Those who've read The Long Halloween will attest to just how creepy the villain can be, given the proper treatment, and thankfully he doesn't go to waste in Arkham City.

Once the player has taken down Two-Face and rescued Catwoman in the Solomon Wayne Courthouse, they can venture downstairs and find Calendar Man locked in a cell. Scanning him solves one of Edward Nygma's many riddles, but Julian Day isn't really one for conversation. That is, unless, you visit him on the right day.

Visiting Calendar Man on specific events and holidays will unlock unique conversations. You can do this either by waiting it out in real life and visiting on certain holidays, or by setting the clock on your console or PC and doing it that way.

In these conversations, Calendar Man reminisces about his old crimes to Batman in his typical creepy style. However, despite players triggering several of these dates and unlocking more and more conversations in the wake of City's release, it took three whole years to find the remaining one - and even then, it looks as though Rocksteady may have had something to do with it.

By setting the date on consoles to December 13, 2004 - the same year Rocksteady was founded - players are treated to one final exchange with Calendar Man that acts both as a metaphor for Rocksteady's development as a studio, and as some heavy foreshadowing for the events of Arkham Knight.

Unrelated but equally spooky, once players complete the Calendar Man achievement/trophy, they'll discover that he's escaped his cell, leaving behind a dead member of Two-Face's crew for Batman to converse with instead.