Alternate costumes
The following characters can be unlocked by spending the indicated amount of Justice League of America shields that can be collected during game play.
Code - Effect
Batman (Batman Beyond infiltration suit) - 74 shields
Batman (classic blue) - 59 shields
Flash (Jay Garrick) - 21 shields
Flash (Walter West) - 48 shields
Green Lantern (bold) - 30 shields
Green Lantern (retro) - 23 shields
Martian Manhunter (modern) - 29 shields
Martian Manhunter (true) - 15 shields
Superman (black recovery suit) - 32 shields
Superman (Earth 2) - 65 shields
Superman (Kandor) - 91 shields
Wonder Woman (biker) - 61 shields
Wonder Woman (toga) - 44 shields
Zatanna (classic blue) - 25 shields
Zatanna (Identity Crisis) - 38 shields
Batman/Zatanna Portal level: Best route
The shortest route is: Green, Green, Yellow, Yellow. This will take you through that portion in the fastest time.
Bonus heroes
The following characters can be unlocked by spending the indicated amount of Justice League of America shields that can be collected during game play.
Code - Effect
Aquaman - 27 shields
Green Arrow - 76 shields
Green Lantern (Hal Jordan) - 84 shields
Green Lantern (Kyle Rayner) - 55 shields
Hawkgirl - 70 shields
Huntress - 53 shields
Cheat mode
Press Start to pause game play. Then, hold L + R and use one of the following cheat codes:
Code - Effect
Up(2), Down(2) - 20 shields
Left, Right, Left, Right - 35 random boosts
Left, Down, Right, Up, Left, Down, Right, Up - Invincibility
Right, Down, Right, Down - Maximum abilities
Right Down Left Up - Purchase all Heroes
Left Up Right Down - Take less damage than usual
Down, Down, Right, Right, Up, Up, Left, Left - Unlimited Energy
Down(2), Right(2), Up(2), Left(2) - Unlimited Superpower
Down, Left, Up, Right - Unlock all costumes
Down Right Down Left - Unlocks all cinematic scenes
Down, Left, Up, Right - Unlocks Everything
Helpful cheats
During the gameplay, press Start. Then at the pause screen, hold L and press the following for the cheat:
All Heroes: right down left up
Invinciabilty: left down right up left down right up
Infinite power: down x2 right x2 up x2 left x2
All Alt. Costume: down left up right
All Cinematic: down right down left