Best weapon:
Use the Gala attack with the Ultimate Armor to have the best weapon that defeats most Bosses, including Sigma (both rounds). Keep using that attack, which is unlimited. Be careful with Sigma, as he keeps moving around.

Ultimate armor for X:
Start a new game. Highlight X at the character selection screen, then press [Up] two times then [Down] nine times. A sound will confirm correct code entry. Press [Enter] to begin game play with the Ultimate armor.

Ultimate armor for Megaman:
Start a new game. Highlight Megaman at the character selection screen, then press [Up] two times then [Down] nine times. A sound will confirm correct code entry. Press [Enter] to begin game play with his Ultimate armor. This armor has unlimited Giga attacks.

Black armor for Zero:
Start a new game. Highlight Zero at the character selection screen, then press [Down] two times then [Up] nine times. A sound will confirm correct code entry. Press [Enter] to begin game play with his Black armor.

Raise your speed:
Note: To do this trick you have to be at the third Maverick stage. Drop down and go to the part where you face the green robot. Stay there and a group of white dots will appear. Face each of them. Keep doing this and your speed pushing buttons will increase. The best character to use is Zero.

Save a life:
After Zero becomes a Maverick you get a new stage. Enter the stage and climb the wall to your left. Collect the helmet (extra life) located there. When you lose a life, you can get it again and you will have the same lives that you started with.

Alternate second half:
If you let the colony collide with the Earth (let all the time run out), an intermission where Zero is infected with the Sigma virus and becomes a powerful Maverick will appear. For the rest of the game you cannot choose Zero and the dialogue changes for a few of the intermissions. Also, Zero fights more aggressively and uses different attacks when you fight him in the third Maverick level.