Unlockables
Do the following to unlock ingame extras
UnlockableHow to unlockEnding CreditsComplete the first 6 galaxiesExtras 15Complete the first 6 galaxiesExtreme 15Beat Extras 15Final Galaxy stages 4650Clear all previous 9 galaxies in yellowMerciless 15Complete Extreme 15Second Ending SquenceComplete Extreme 15Third Ending Credits SequenceClear all galaxies