Defeat the indicated Boss as an Autobot (to unlock an Autobot Boss) or a Decepticon (to unlock a Decepticon Boss) in the Arena to unlock them as a playable character.
Character | How to defeat
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| - Defeat him in Streets stage #6 (Arena stage #18).
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| - Defeat him in Stadium stage #6 (Arena stage #6).
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| - Defeat him in Dam stage #6 (Arena stage #24).
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| - Defeat him in Streets stage #6 (Arena stage #18).
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| - Defeat him in Purification stage #6 (Arena stage #30).
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| - Defeat him in Dam stage #6 (Arena stage #24).
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| - Defeat him in Stadium stage #6 (Arena stage #6).
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- Motormaster ( Decepticon )
| - Defeat him in Sewers stage #6 (Arena stage #12).
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| - Defeat him in Purification stage #6 (Arena stage #30).
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| - Defeat him in Sewers stage #6 (Arena stage #12).
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