True final boss: Nega-Mother Wisp
After clearing Terminal Velocity with all emeralds, wait until the credits are over, then go back into the game. You'll get a quick cut scene and the final stage will be accessible from the very top of the world map.
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Unlockable |
How to Unlock |
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Nega-Mother Wisp |
Collect all seven emeralds and clear Terminal Velocity |
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