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Fast health recovery
Improve your health recover and the strongest weapon for the character you are currently using. For example, upgrade the Flash's Whirlwind ability or Wonder Woman's Tiara throwing ability with Damage and Duration boosts. All the characters lose health quickly to most any kind of attacks. It is recommended to have a fast recovery of health. Use the Speed Boosts in all the recovery slots.
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Invincibility
Pause the game, then keep pushed L + R and press Left, Down, Right, Up, Left, Down, Right, Up. If you entered the code correctly, you will hear a sound.
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Alternate costumes
The following costumes can be unlocked by spending the indicated number of Justice League of America Shields that can be collected throughout the game:
| Superman (Earth 2) | 65 Shields |
| Wonder Woman (biker) | 61 Shields |
| Zatanna (classic blue) | 25 Shields |
| Green Lantern (retro) | 23 Shields |
| Martian Manhunter (modern) | 29 Shields |
| Green Lantern (bold) | 30 Shields |
| Batman (Batman Beyond infiltration suit) | 74 Shields |
| Batman (classic blue) | 59 Shields |
| Wonder Woman (toga) | 44 Shields |
| Superman (Kandor) | 91 Shields |
| Flash (Jay Garrick) | 21 Shields |
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| Flash (Walter West) | 48 Shields |
| Martian Manhunter (true) | 15 Shields |
| Superman (black recovery suit) | 32 Shields |
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| Zatanna (Identity Crisis) | 38 Shields |
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Completion bonuses
Successfully complete the game to unlock the 'Continued Play' option, which allows a new game to be begined with all previous stats and items, and an alternate main menu background (with characters from the game).
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35 random boosts
Pause the game, then keep pushed L + R and press Left, Right, Left, Right. If you entered the code correctly, you will hear a sound.
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Infinite Superpower
Pause the game, then keep pushed L + R and press Down(2), Right(2), Up(2), Left(2). If you entered the code correctly, you will hear a sound.
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Bonus heroes
The following characters can be unlocked by spending the indicated number of Justice League of America Shields that can be collected throughout the game:
| Green Lantern (Hal Jordan) | 84 Shields |
| Hawkgirl | 70 Shields |
| Aquaman | 27 Shields |
| Green Lantern (Kyle Rayner) | 55 Shields |
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| Green Arrow | 76 Shields |
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| Huntress | 53 Shields |
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20 shields
Pause the game, then keep pushed L + R and press Up(2), Down(2). If you entered the code correctly, you will hear a sound.
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Maximum abilities
Pause the game, then keep pushed L + R and press Right, Down, Right, Down. If you entered the code correctly, you will hear a sound.
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All costumes
Pause the game, then keep pushed L + R and press Down, Left, Up, Right to unlock all costumes. If you entered the code correctly, you will hear a sound.
