The Puzzle Fighter games are a bit... different. You have to take characters from the Darkstalkers and Street Fighter series up against each other in a battle of wits by sorting colored blocks.
But say, for example, that when you select your character that you highlight Morrigan (Felicia if you're player 2)
Then you hold down the Start button and hit Down on the joystick 13 times, and then press any button to select your character?
Why, your character turns into comic-relief character Dan, who's typically a little on the weak side in all the games he appears in (but can be unstoppable in the hands of a skilled player).
Can you finish the game with underpowered Dan?
Good luck!