57e47233_and_Secrets_for_3DS___GameFAQs__How_to_Unlock
[Unlockable] Clear Headed [How to Unlock] 
Hey! Got time to kill? Try to clear Arcade Mode on Medium or higher! That's all you gotta do!
Super Street Fighter IV: 3D Edition Cheats, Codes, and Secrets for 3DS - GameFAQs