Alternate costumes:
Hold L1 + R1 when selecting a character in either versus mode or battle mode.

Fight as Rogue:
Select versus mode. Press the following buttons on the character select screen. For player one, highlight Ranma and press Right(3), Down, Left(3) Up, and any button to select Ranma. For player two, highlight Ryouga and press Left(3), Up, Right(3), Down, and any button.

Sound test:
Set the CPU level to "1", time limit to "30", and rounds won to "1". Select story mode and uncover all stones except one. Save and reload the game at regular intervals to avoid mistakes. A special red stone will appear to the right of the starting location after only one stone remains. Uncover the red stone to enter sound test mode.

Control opening screen:
Press the D-pad to move man on the loading screen. Press Circle to have him do other things.