Pause the game, select the "Extras" option, and choose the "Enter Code" selection. Then, enter one of the following codes to activate the corresponding cheat function.
Effect
Code
Aquaman
V3GTHB
Atrocitus
ZGCEAJ
Bane
XZKLKQ
Batgirl
4LS32K
Batman (Planet X, Zur-En-Arrh)
ZWQPJD
Beast Boy
YC3KZZ
Blue Beetle
APEKBV
Deathstroke
5SW59X
Doctor Fate
4HRERD
Festive Hats
PHHGPH
Fight Captions
EWTPKA
Frankenstein
FQ4ESE
Giganta
95U7BM
Kevin Smith
J6ANCT
Lobo
B5ABPQ
Minikit Detector
JYJAFX
Music Meister
S7GSDE
Nightwing
N9CZ7S
Plastic Man
H2VB8Z
Quest Detector
KNJBD8
Red Hood
TRQTPS
Studs x2
5MZ73E
Superboy
QDQ3YL
The Fierce Flame
NQ46RC
The Joker
9WYGLP
Easy studs
Play "The Lantern Menace" level in Free Play mode. Go to the first part, and progress from the start until you reach the point where you are facing a large Brainiac skull in a symmetrical room. On the right side is an electric field, and on the left an electric port. Switch to any character that has an electricity suit (put on infinite electricity, if desired), and fill the port on the left. This will get rid of the Brainiac tentacles on the top of the stairs, and fire should replace them. Switch to Superman, and walk in the middle of the fires. Initiate his freeze-breath to extinguish the fire and get studs for it, but the fire will immediately return. Keep extinguishing the fire with Superman to get as many studs as desired. Use any stud multiplier to make this even more effective.
Secret 1966 Batman TV Show level
Successfully complete the game to unlock the "Same Bat-Time! Same Bat-Channel!" bonus level. Go to the Batcave's main room, and fly up to the elevator with the Bat-logo to the left of the Batcomputer. When in the trophy room, fly to the far right to reach the studio set, which looks similar to the Wayne Manor study in the 1966 Batman TV show. Switch to Batman or any character with a grapple gun. Pull the grapple point to the left of the bookcase to reveal a secret passage. Slide down the pole to start the bonus level.
Storyline characters
Some characters can be unlocked naturally by progressing through the storyline, while others require a character token to unlock them for purchase at the store. Successfully complete the indicated task to unlock the corresponding character.
Character
How to unlock
Alfred
Get the "Activate The Elevator" objective at the start of Hub Visit 1.
Batman
Start Level 12.
Brainiac
Successfully complete Story mode.
Cheetah
Start Level 8.
Cyborg
Start Level 3, and get the rocket ready.
Green Lantern
Get the "Restore The Com Link" objective in Hub Visit 2.
Indigo-1
Progress through the storyline.
Killer Croc
Progress through the storyline.
Lex Luthor
Defeat Mr. Freeze at the start of Hub Visit 5.
Martian Manhunter
Get the "Restore The Com Link" objective in Hub Visit 2.
Cheat Codes...