Street Fighter 3 Double Impact Codes -

Fight as Yang:
Highlight Yun at the Street Fighter 3 character selection screen and press any Kick button.

Fight as Gouki (Akuma):
Highlight Sean at the Street Fighter 3 Second Impact character selection screen and press Up.

Fight as Shin Gouki:
On Street Fighter 3 Second Impact, set the game to "Easy", time to "On", hit damage to "High", one round, and play as Ryu. Then, in arcade mode, never lose a round, defeat as many opponents with perfects and super finishes. You should find your half way boss or AKA rival. Defeat him (Sean)and fight all the way to the end of the game on your last man. Gouki will appear and hell death murder your last man. Defeat him without losing the round. If you do, he will get up and turn into Shin Gouki. Defeat him and not only will you get a different ending but you will get to play as Shin Gouki. To do so, highlight Gouki at the character select screen and hold Start before you press a button.

Fight as Gill:
Successfully complete Street Fighter 3 or Street Fighter 3 Second Impact under any difficulty setting. Highlight Sean at the character selection screen and press Up(2).

Extra options:
Unlock Gill and Shin Gouki. Enter the option screen of either game and hold L + R. Keep those buttons held until the extra options appear at the end of the code. Highlight the "Game Option" selection and press Left(2), X(2), Right(2). Highlight the "Button Config" selection and press Left(2), Y(2), Right(2). Highlight the "Screen Adjust" selection and press Left(2), X, Y, Right(2). Highlight the "Sound" selection and press Left(2), Y, X, Right(2). If done correctly the "Extra Options" selection should now be unlocked.

Full pause screen:
Pause game play, then press X + Y.

Find your rival:
Choose "2nd Impact" when you have the choice of playing either "New Generation" or "2nd Impact". Go to the options menu and set the difficulty to at least four stars. Select arcade mode and choose a fighter and Super Art. Now, within the first four opponents, three of the four must be finished off with the Super Art. The fourth opponent must be finished with the Super Art. It does not matter which two of the other three are finished off with the Super Art. After defeating the third opponent with the Super Art, the "Your Rival has Found" message will appear. You will then be challenged by your rival, with a short exchange of written dialogue on the vs. screen.