Unlock X:
To unlock X, save 64 hostages/robots.

Alternately, defeat two Bosses to unlock X.

Zero:
You will unlock Zero as you progress with Axl.

Jungle stage: Extra lives:
There is an extra life at the beginning of the stage. Immediately when 
Megaman/Zero/Axl warps into the stage, zoom behind you to get it. After 
completing the stage, keep coming here, exit, and repeat to get the maximum 
number of lives.

Alternate X appearance:
Hold Select and choose X at the character selection screen to see him with all his 
armor. 

X's Ultimate Armor:
Find the large blue things for the parts of X's Ultimate Armor (as in the previous 
games in the series).

"Lava" stage: Look low for it in the first phase of the stage. 
"Airplane" stage: Look in the maze-like room in the second phase of the stage. 
"Computer" stage: Use the portals to reach it in the second phase of the stage. 
"Jungle" stage: After the "spike" area, there will be two stone spitting rocks, one 
on top the other. Use these two rocks to jump up top to the left area on a tree 
branch to get the blue pod containing the boots. 

Defeating Sigma's first form:
Sigma is very easy in his first form. Use X and Zero. Sigma mostly jumps around 
and shoots a pink laser. Stay down when he is firing the laser and blast him with 
the X Buster and Volt Tornado. Slash him as he jumps around with Zero's Saber, 
but try not to get hit. Then, finish him off with the Giga Crush. If done correctly, 
you will not need to use any sub tanks or lose any life.

Defeating Sigma's final form:
When Sigma's final form uses its Green Ball attacks, use Zero's Green Charged 
shield (hold Square). Zero will charge into Green Energy, and it will bounce the 
attack back to Sigma. When Sigma uses its Force Charged Punch, dash to right 
side then counter its attacks.

Go up to the second highest rock to the left, and hide behind the highest rock. By 
doing this, Sigma cannot hit you with anything except the pink laser. Stand there 
and blast away with anything long range and you will kill him eventually.

Stay in the crack between the two top platforms. None of his attacks will be able to 
hit you. The punch will go past you and his fire balls will hit the platforms before 
they hit you. However, the laser can still hit you.

Defeating Soldier Stonekong:
Jump over the shield he throws and dodge the boulders by standing directly 
opposite of him. Sometimes he may not ever summon a boulder if you use Zero to 
slash or stun him, then Axl to just fire away.

Defeating Palace Road Boss:
When you get to fight the annoying roller boss on the Palace Road, switch to Zero. 
When it comes close, press R2 to do the fireball attack. After about two blasts, his 
drum will explode, exposing a drill. Continue to slash him with the saber. When 
your life is low, switch to X and finish it off with the Giga Crush.

Defeating enemies:
To easily defeat an enemy, use Zero's Tornado Slash, It is very effective and is 
able to blow up any enemy.

Hyenard stage: Shortcut:
If you have the leg part for X, you can skip the entire second half of Hyenard's 
stage. When you start, turn left so you can see the far platform. Jump and glide 
over to it. When you get directly against it, press Jump to climb up. If done 
correctly, shoot a few enemies and walk to the transporter. Note: This may take a 
few attempts. 

Roll while dashing as Axl:
Press Circle again while dashing. The best thing about this maneuver is that all 
shots that are fired upon Axl while he is rolling will miss him, resulting in less 
damage and possibly a higher Hunter grade.

Hover as Axl:
Hold Jump (default is X) to hover. When you are hovering, you can stay in the 
same place or move around (with the D-pad or the Left Analog-stick) for a limited 
time. When you are hovering, you can fire Axl Bullets with the Normal Attack 
(default is Square). You will know that the hovering time is almost up by a slow 
decrease in altitude. This is a good trick to use when you cannot get to a place 
without a farther jump, such as Zero's Double Jump, or when you need to be in 
the air or need some height to kill an enemy.