To unlock her complete adventure, classic and all-star mode on very hard with one life with Fox and Falco. In classic you have to beat Giga Bowser in under 1 minute, and in all-star you cannot use any health items, including the heart containers at the start. Then you'll fight her and after you beat her the game will say, "She's yours to control, here's Krystal!" It's sort of a pun, because Krystal is kind of a mage that can control all forms of crystals and gems. You probably don't know this because she doesn't use this power (Or magic, or psionic, or....) in any of the games or comics. Her powers are; B) Krystal Assualt Rifle: a rapid fire machine gun that fires crystals, B+Left/Right) Krystal Blade: creates a crystal blade as big as her while she charges forward at an insane speed, B+Up) Krystal Komet: Krystal encases herself in a crystal orb and shoots herself in the direction that you point the control stick, B+Down) Krystal Sheild: Krystal encases herself in a crystal orb that deflects things. Every time something is deflected, the sheild cracks a little until it breaks and Krystal is stunned. So basicly she's Fox, except when she uses Krystal Blade or Krystal Komet, she leavs a trail that can be used for a makeshift platform that disapates in a few seconds.