메가맨 X6 / 록맨 X6

X's Ultimate Armor:
Press Start at the title screen, then press Left(3), Right at the main menu before starting a new game. A sound will confirm correct code entry. You will begin the game with X's Ultimate Armor.

This is X's ultimate armor. It is basically X's armor from Megaman X4 and X5 (known as the Fourth Armor). It has nice defense and the ultimate power, Invincible Dash. Note: You will never use up Giga Attack energy when using the Giga Attack.

Nightmare Zero:
Press Start at the title screen, then press L1(3), R2 at the main menu. A sound will confirm correct code entry. Start a new game. When you rescue Zero after defeating him in battle, you will play as the Nightmare version of Zero. Nightmare Zero has all of Zero's normal moves, but he is much more powerful.

"GA" rank:
To get rank "GA", obtain 2,000 to 3,000 Soul. 

"PA" rank:
To get the rank "PA", obtain 5,000 Soul. 

"UH" rank:
To get the rank "UH" obtain 9,999 Soul.

Ending bonus:

Get a high rank, such as "GA", "PA", or "UH", then complete the game and wait for the ending credits to finish. After the credits end there should be a screen showing you two game secrets.

출처 : http://www.gamewinners.com/playstation/MegamanX6.htm