How do I access the additional content?

To play the Harley Quinn's Revenge DLC:

Select the Harley Quinn's Revenge DLC option from the Main Menu.

To play the Catwoman DLC:

The four Catwoman missions are included in the main game. You will encounter these as you play through the story.

Once you have completed the main story, you will be able to switch between playing as Catwoman and playing as Batman as you explore Arkham City. To do this, look for groups of cats lounging together: you can switch between the two characters at these points by clicking the Left Mouse button.

These areas are also indicated on the Batcomputer Map with a pink Catwoman marker.

To play one of the challenge maps included in the expansion packs:

Select Riddler's Revenge from the Main Menu.
Select the character you wish to play as (Batman, Catwoman, Robin or Nightwing).
Select one of the challenge types (Ranked Challenges, Campaigns or Custom Challenges).
Use the Left and Right arrows on the screen to cycle through different pages of maps, highlight the map you wish to play, then press the Return (⏎) key.

To play a challenge map as Catwoman, Nightwing or Robin:

Select Riddler's Revenge from the Main Menu.
Select either Catwoman, Nightwing or Robin.
Proceed with points 3 and 4 of the challenge map instructions (above).

To play a challenge map using an alternative character skin:

Select Riddler's Revenge from the Main Menu.
Use the Up (▲) and Down (▼) Arrow keys to cycle between available outfits. Once the character is displayed wearing the skin you wish to use, press the Return (⏎) key.
Proceed with points 3 and 4 of the challenge map instructions (above).

To play the main campaign using an alternative Batman skin:

You must first complete the main campaign on the Normal or Hard difficulty setting.

Once you have done this, you will be able to play the main campaign using an alternative skin for Batman by selecting New Game Plus from the Main Menu. You will then be asked to select a skin for Batman, simply highlight the one you wish to use, then press the Return (⏎) key.

You can also explore Arkham City using an alternative Batman skin after you have completed the main story by selecting Continue Story from the Main menu and then selecting an alternative skin for Batman.