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

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

Aquaman V3GTHB
Atrocitus ZGCEAJ
Bane XZKLKQ
Batgirl 4LS32K
Batman (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

V3GTHB - Aquaman
ZGCEAJ - Atrocitus
XZKLKQ - Bane
4LS32K - Batgirl
ZWQPJD - Batman (Planet X, Zur-En-Arrh)
YC3KZZ - Beast Boy
APEKBV - Blue Beetle
5SW59X - Deathstroke
4HRERD - Doctor Fate
NQ46RC - The Fierce Flame
FQ4ESE - Frankenstein
95U7BM - Giganta
9WYGLP - The Joker
J6ANCT - Kevin Smith
B5ABPQ - Lobo
S7GSDE - Music Meister
N9CZ7S - Nightwing
H2VB8Z - Plastic Man
TRQTPS - Red Hood
QDQ3YL - Superboy
PHHGPH - Festive Hats
EWTPKA - Fight Captions
JYJAFX - Minikit Detector
KNJBD8 - Quest Detector
5MZ73E - Studs x2

Holiday Hats PHHGPH
Music Meister S7GSDE
Superboy QDQ3YL

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
Frankenstein FQ4ESE
Giganta 95U7BM
Kevin Smith J6ANCT
Lobo B5ABPQ
Nightwing N9CZ7S
Plastic Man H2VB87
Red Hood TRQTPS
The Fierce Flame NQ46RC
The Joker 9WYGLP
Fight Captions EWTPKA
Holiday Hats PHHGPH
Minikit Detector JYJAFX
Music Meister S7GSDE
Quest Detector KNJBD8
Studs x2 5MZ73E
Superboy QDQ3YL

The beginning screen before you start the actual game, scroll down until you see cheats. Then put the cheats in.

Passwords from official guide

"Bat-Fight" Captions Red Brick EWTPKA
"Festive Hats" Red Brick PHHGPH
"Minikit Finder" Red Brick JYJAFX
"Quest Finder" Red Brick KNJBD8
"Studs Score Multiplier x 2" Red Brick 5MZ73E
AquaMan V3GTHB
Atrocitus ZGCEAJ
Bane XZKLKQ
Batgirl 4LS32K
Batman (Zur-En-Arrh) ZWQPJD
Beast Boy YC3KZZ
Blue Beetle APEKBV
Deathstroke 5SW59X
Doctor Fate 4HRERD
Frankenstein FQ4ESE
Giganta 95U7BM
Kevin Smith J6ANCT
Lobo B5ABPQ
Music Meister S7GSDE
Nightwing N9CZ7S
Plastic Man H2VB8Z
Red Hood TRQTPS
Superboy QDQ3YL
The Fierce Flame NQ46RC
The Joker 9WYGLP

Alfred Get the "Activate The Elevator" objective at the start of Hub Visit 1.
Batman (The Joker disguise) 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.
Plastic Man Defeat Mr. Freeze at the start of Hub Visit 5.
Robin (Lex Luthor disguise) Start Level 12.
Saint Walker Progress through the storyline.
Solomon Grundy Defeat Mr. Freeze at the start of Hub Visit 5.
Star Sapphire Progress through the storyline.
Superman Start Level 7.
The Flash Start Level 3, and get the rocket ready.
The Joker Progress through the storyline.
Wonder Woman Start Level 6.
Wonder Woman (Cheetah disguise) Start Level 12.

Batman Theme Song

Go to the character select screen and let the cursor sit over a character. (Don't select anyone, stay on the screen.) Waiting for a moment causes the selected character to sing the Batman Theme from the tv show. Note: Does not work with all characters.