These secret battles can only be unlocked in Arcade Mode.
| Battle | How to Unlock
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| Secret "Jade" Battle | Get a double flawless victory and perform a fatality on Shang Tsung when battling against him.
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| Secret "Noob Saibot" Battle | When you see Noob in "The Temple" stage's background win that battle without using the R2 (Block) button.
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| Secret "Reptile" Battle | On "The Pit 2 (Night)" stage wait until a shadowy figure flies across the moon, then get a double flawless victory and perform a stage fatality.
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| Secret "Smoke" Battle | On "The Living Forest" stage wait until Smoke appears behind one of the trees. On that moment press Down + Select repeatedly.
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