At the title screen where it says "press start", enter the codes then, start a new game on normal or hard and the blade and the 2 characters will be available at the development shop for purchase.

To fight Cutman, go to the end of Optic Sunflowers stage.

At the Title Screen where it says "press start", type the following codes in:

Enter Code at the title screen.

Enter any the following codes at the title screen while the words "Press Start" are flashing:

Simply complete the game and then load your clear file. The Sigma-Blade will now be available for purchase in the R&D Lab.

You can do a shoryuken with X (in his ultimate armor).

Hold Up and press triangle.

This move appeared in Megaman X2 as an ultimate move (like the Hadoken in Megaman X1). It's not powerful at all, but a fun easter egg.

Equip the K Knuckle on Zero and jump up and press Triangle.

If you have a Megaman X: Command Mission save on the same memory card that you are saving on in X8, you can battle Cutman at the end of Optic Sunflower's stage.

This glitch is intended to give you the max number of metals in the game in just one pause during gameplay. First you need to have a life tank and make sure its not completely full, recommended half full. Second you need to have less than 50 metals. Go to the the R&D development room and get a life charge for the life tank which costs 50 metals to obtain, the game will glitch out and your metal counter will disappear from screen. go to any level and go find a single metal anywhere on the level, the metal counter will increase insanely. Now press start to pause and bring up the player menu screen, your counter will read 9999999, the maximum number of metals possible in the game!