Note! This title is also known as Rockman X5 

X Buster's Super Nova armor:
     At the character selection screen, highlight X Buster, then press
Up, Up, Down, Down, Down, Down, Down, Down, Down, Down, Down, Circle.

Zero's Black armor:
     At  the  character  selection  screen, highlight Zero, then press
Down, Down, Up, Up, Up, Up, Up, Up, Up, Up, Up, Circle.

To get Zero's secret gold armor:
     At  character  select screen, press Up, Up, Up, X, X, Circle, Up,
Down,  Circle,  Triangle,  Up,  Left,  Triangle.  A new option will be
available, choose it to get the gold armor.

Zero Supreme Slash:
     Press Forward and Square at the same time and you will be able to
use Zero Supreme Slash, this is good for finishing off bosses.

Different endings:

- if you start and beat the game with X, you get a sad ending
- if you start and beat the game with zero, you get a different sad
  ending
- if you start the game with zero, but beat it with X, you get a nice
  happy ending