Vs. Mode - Character and Level Select
After a "Vs." match has been completed, press L + R to access a menu which allows you to select your character and level.

Ranking Mode
At the title screen, press Down-Right + C + L + R + Start.

Play as Dural
At the character select screen, press Down, Up, Right, Left + A.

Hidden Options Menu
At the Title Screen, press UP 12 times, then press START.. Go into Options and move the cursor off the bottom of the screen to uncover the Hidden Menu.

Freeplay Mode
At the title screen press X + Y + Z. You will read the words "Freeplay mode" at the bottom-left side of the screen. What this code does is it disables pausing during the game. It also changes the words "LICENSED BY SEGA" etc. at the title screen to a different font