Batman Arkham City Part 6: Completing Side missions/collecting Riddler trophies

Part 6 is just about completing the side missions and collecting Riddler trophies to help build up Batman's experience level to gain skill points to purchase special skills or talents to use as I progress through the game. There were at least two Riddler trophies that took a while because they dealt with mines. Part 7 will continue on the main story.