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Infinite Boost
Collect every red special ring hidden in each of the 6 main zones, and you will be rewarded with an unlimited boost gauge. You may enable or disable it in the options, and it may not be used in time attack or versus mode.
- Collect every special ringInfinite Boost
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 cutscene and the final stage will be accessible from the very top of the world map.
- Collect all seven emeralds and clear Terminal VelocityNega-Mother Wisp