To change costume color press either D and A , U and A or D and C,U and C.The costume color differs with the buttons you press.
More Options
At the Options screen, highlight EXIT and press Left repeatedly until another Options menu appears.
More Time to Select Characters
If you need more time to choose your character, press Down, Up, Right, Left + A on the character selection screen. You now have 99 seconds to make a selection.
No Damage
At the options screen press B on Player-1's life. Keep pressing B until you see the words No Damage Then press START.
Play as Dural
At the character selection scene, hold Left until you hear a countdown and it reaches one. Dural will show up and you will be able to play as him.