Extra Characters
Enter "ZAQ637" to play as Alfred Pennyworth, Bruce Wayne's loyal butler and confidant, or "DDP927" to play as Commissioner Gordon. You can also enter codes to play as the major villains' underlings. For example, "NKA238" unlocks Penguin's Goon, while "YUN924" unlocks Joker's Henchman.
Extra Effects
Enter "WYD5CP" for invincibility. To attract studs, the game currency, enter "LK2DY4." Enter "N4NR3E" to double your score, or "18HW07" to multiply it by 10. You can also modify your weapons. "D8NYWH" will give you Flaming Batarangs, while "XPN4NG" will give you Freeze Batarangs.
Extra Vehicles
Enter "LEA664" to pilot Bruce Wayne's private jet, or enter "DUS483" to joyride in a garbage truck. Enter "BTN248" for Penguin's submarine, "HAHAHA" to pilot Riddler's jet or "JUK657" to drive Joker's van.
Game Play Extras
Some features available by completing missions include new playable characters like Catwoman and the Joker. Catwoman is accessible after "Chapter 2-2: Stealing the Show" and the Joker after "Chapter 3-1: A Surprise for the Commissioner." Extra vehicles are also available. For example, you unlock Scarecrow's Bi-Plane by completing "Chapter 3-2: Bi-Plane Blast."
Hostages
The 25 hostages are on levels that do not center on a vehicle. For example, you can find hostages on "Chapter 1-1: You Can Bank on Batman" and "Chapter 1-2: An Icy Reception," but not on "Chapter 1-3: Two-Face Chase" which requires the Batmobile. Go to the level selection screen to see if you missed any hostages. A smiley face indicates they're all safe; a frowning face indicates a hostage remains in the area. After you collect all of the hostages, you can unlock the villain Hush.