CheatCodes.com has all the official Street Fighter Alpha PSX cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Wednesday May 22, 2013 for Street Fighter Alpha are shown below.
At the character selection screen, highlight the "?" box and hold L2. Then, press Left(3), Down(3), Square + Triangle. Now you can play as Akuma in a black costume. To play Akuma in a maroon costume, substitute the last step of the code with X + Circle. For player two to play Akuma, substitute Right for Left in the code.
At the character selection screen, choose any character and immediately hold R1 + R2 + X. Then, hold the buttons until Akuma performs his "Bison Killer" move into your next opponent.
At the character selection screen, highlight the "?" box and hold L2. Then, press Triangle, Square, X, Circle. Now you can play as Dan in a pink costume. To play Dan in a green costume, substitute the last step of the code with Circle, X, Square, Triangle. Dan may be saved on the memory card.
Fight in arcade mode until the fifth fight has been won. Then, hold Up + L2 + R2 until the next "VS" screen appears. If you entered the code correctly, the phrase "A new challenger has entered" will appear. Dan will be the next opponent.
At the character selection screen, highlight the "?" box and hold L2. Then, press Left(2), Down(2), Left, Down(2), Square + Triangle. Now you can play as M. Bison in a red costume. To play M. Bison in a gray costume, substitute the last step of the code with X + Circle. For player two to play M. Bison, substitute Right for Left in the code.
Note: Two players must enter this code. On both controllers, hold Start and press Up(2), then release Start. On both controllers, press Up(2). On controller one press Jab and Fierce on controller two simultaneously.
To save M. Bison in memory, beat the game with an eight star difficulty without changing characters, using someone whose end boss is Bison. To save Akuma, beat him after going through the ten super combo finishes method with a difficulty level of five or more stars. To save Dan, beat him on the game with a difficulty of six or more stars. Save the game after achieving any of the previous tasks to place the character in memory. Then, press Down at the "?" box on the character select screen to view the secret characters.
Player one as Ryu and player two as Ken can work as a team versus M. Bison. Beat the game on any difficulty setting with more than four stars. Continues can be used, but characters can not be changed.
After a fight is won, enter one of the follow codes for a different winning text: Down + Circle + X, or Down + Triangle + Circle, or Down + Square + X.
At any time except when the game is loading, press Circle + Square + X + Triangle + Start + Select + L1 + L2 + R1 + R2.
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