Extrem  X:  At  the  Character Select Highlite X and Press & Hold
DOWN  and hit the Space Bar. X will teleport onto the Intro stage in a
purple  shade on his legs and arms (More Pruple towards the top of his
legs  and  arms).  After completing the Intro stage go to Web Spider's
stage   and  get  your  Leg  Enhancments.  Instead  of  JUST  the  Leg
Enhancement  you get EVERYTHING only 4X stronger and a diffrent color.
You also get Unlimited Use of the Powerful "Nova Strike".

     Dark  Zero:  Nothing  Special  about  him but it's A LOT more fun
going  through the Game with Zero in his Spy Armor. At the Char Select
screen  Press  and  hold  UP and hit the space bar. Zero will Teleport
onto the Intro stage wearing his Black Spy Armor.