To unlock additional Challenges, you'll need to play Story Mode. Most Challenges can be unlocked by finding certain Riddler Trophies. You can find a complete list of the Riddler Trophy locations here. Here is a complete list of the Challenges with the Riddler Trophies that unlock them. Some Challenges are unlocked just by playing the game.
- Intensive Treatment - ???
- Silent Knight - ???
- Sewer Bat - ???
- Record Breaker - ???
- Shock and Awe - Find the Riddler Trophy for Botanical Gardens Riddle #24
- Survival Tactics - Find the Riddler Trophy for Caves Riddle #20
- Rumble in the Jungle - Find the Riddler Trophy for Caves Riddle #9
- Invisible Predator - Find the Riddler Trophy for Arkham Island, West Riddle #9
- Intensive Treatment Extreme - Find the Riddler Trophy for The Penitentiary Riddle #8
- Silent knight (Extreme) - Find the Riddler Trophy for Botanical Gardens Riddle #29
- Sewer Bat Extreme - Find the Riddler Trophy for Intensive Treament Riddle #30
- Record Breaker (Extreme) - Find the Riddler Trophy for Caves Riddle #19
- Shock and Awe (Extreme) - Find the Riddler Trophy for Medical Riddle #28
- Survival Tactics (Extreme) - Find the Riddler Trophy for Mansion Riddle #29
- Rumble in the Jungle (Extreme) - Find the Riddler Trophy for Caves Riddle #23
- Invisible Predator (Extreme) - ???
There are two types of Challenge in Challenge Mode: Combat and Predator. The former requires you to fight waves of enemies to score points. The latter has you take out enemies in a room using stealth and strategy -- and there are specific requirements for each room. The following video should help explain Challenge Mode's intricacies.
Predator Challenges require serious skill and careful strategy. The following video walkthroughs show how to complete each Predator Challenge, satisfying all requirements.
Predator Challenge videos by Dareon Hanlon (Y2KFrosty)
In the PS3 version of the game, Joker is avaible as a playable character through a free DLC. The Joker is playable on the 8 challenge maps (he has no "expert" versions). Each of his challenges have been renamed and redesigned.
Differences from batman
The Joker has an all new playing style, with 3 new gadets to replace Batman's 8.