Gambler Jiko Chuushinha

Select "Free Mode" at the game mode menu. At the character selection screen, press Up + B on controller two. Then, press Up + Right + B on controller two. Then, press Down, Right, Up on controller two. Then, press A + B on controller two. Press Left on controller two. A sound will confirm correct code entry.

At the game mode screen, select Free Mode. Then at the character selection, always on controller 2, press Up + B at the same time. Then press Up + Right + B at the same time. Then consecutively press Down, Right & Up and then press A + B at the same time. Then finally press Left. If done right, a sound will be heard. It's a bit difficult to get the code working, but just try it over and over a few times until you hear the sound.