To fight as Dural with a particular costume color, highlight Akira and enter the corresponding code below.

Blue -- Up, Down, Right, Left + A
Gold -- Down, Up, Left, Right + A
Red -- Up, Down, Left, Right + A
Red w/ white eyes -- Up (2), Down, A + Up
Yellow/green -- Left, Right, Down, A + Up

To play as Dural, highlight Akira at the player select screen and press Down, Up, Right, Left + A.

Beat the game in arcade mode on normal or higher difficulty. Once you beat the game with a character, the FMV for that character will be in the movie room option. Do this for all characters to have access to all their movies.

To enable wire frame mode complete the game at Hard difficulty. Then, at the character selection screen, hold L + R until the next game begins.

To see a fish inside Dural's head, select Dural with an alternate costume. When the prompt for Normal or Kids mode appears, hold C until the match begins.