57e47233_and_Secrets_for_3DS___GameFAQs__How_to_Unlock
[Unlockable] Barrel of Laughs [How to Unlock] 
No need for barrels without oil! Score 110,000 points or more in the Barrel Buster bonus stage.
Super Street Fighter IV: 3D Edition Cheats, Codes, and Secrets for 3DS - GameFAQs