Highlight the "Camera" selection on the options screen. Press Right until the "Backside 1P" and "Backside 2P" options appear.
Alternate costume color
Hold Up or Down and press A, B, or C in different combinations at the character selection screen. Down + Start may also be pressed to select yet another combination.
Control replay camera
Use the D-pad to select new camera angles during replay mode. Press A, B, or C to change camera views.
Dural mode
Select tournament mode and press Down, Up, Right, A, Left at the character selection screen.
Extra options
Wait until "Press Start" flashes at the opening screen. Sweep the D-pad in three clockwise Full-Circles. The sound of a punch will confirm each successful sweep. Sweep the D-pad in two counter-clockwise Full-Circles. The sound of a punch will confirm each successful sweep. Then, press Start. The word "K.O." will confirm correct code entry. Stage select, time, and life bar selections will appear at the bottom of the options screen.
Fight as Dural
Select arcade or versus mode and enter the character selection screen. For player one, highlight Akira and repeatedly press Left, Right until a sound is played. For player two, highlight Jacky and repeatedly press Right, Left until a sound is played. Dural will be selectable to the right of Jacky.
Additional camera views...