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.
Unlockable How to Unlock Infinite Boost Collect every special ring
Contributed By: mtpfreak.
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.
Unlockable How to Unlock Nega-Mother Wisp Collect all seven emeralds and clear Terminal Velocity
Contributed By: DeeNinjaa.
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