Cheat mode:
Hold Select and press Start at the title screen. The options screen
will appear. Hold R and press Up + X, Right + A, Down + B, Left + Y.
The cheat mode screen will appear allowing switching to a two player
game, use of any fighter, and selecting the background music and
graphics.
Unlimited continues:
Hold Select and press Start at the title screen. The options screen
will appear. Hold L and press Up + X, Left + Y, Down + B, Right + A.
A credit option screen will appear allowing selection of one, three,
five, or an unlimited number of continues.
Sites: