Undiscovered Riddler Scerets in Arkham City?

It was reported from Rocksteady Studios director head of 2011’s Batman: Arkham City, Sefton Hill during a panel at londons Comic-Con that there are 3 or 4 easter eggs players havent uncovered. “There is one that we had right in one of the first demos that we did that nobody has found..it’s in there  you have to look hard enough” Hill said. Rocksteady isn’t new to putting easter eggs, in the 2009 release of Batman: Arkham Asylum that game was filled with many nods to batman characters and stuff from the television series, there are many easter eggs already in Arkham City some that are really cool such as:

*SPOILER ALERT*

Killer Crocs cell, Scarecrows boat, and especially the one that everyone is talking about the found “positive” preganancy test next to Harleys costume *possible sequel* and etc.

So now that you know there are still undiscovered easter eggs in Arkham City, I think to put on the cowl and be the detective once again and look through every nook and cranny. You could be the first person to discover them.