Hint 1: Successfully complete Megaman X.
Hint 2: Successfully complete Megaman X2.
Hint 3: Successfully complete Megaman X3.

Images 7: Successfully complete Megaman X2.
Images 8: Successfully complete Megaman X.

Music 2: Successfully complete Megaman X4 with X.
Music 3: Successfully complete Megaman X4 with X.
Music 4: Successfully complete Megaman X3.

Staff: Successfully complete Megaman X.

Megaman X3: Golden Hyper Armor - Before reaching Dr. Doppler's fortress, collect all 8 Heart Tanks, all 4 E-Tanks, all 4 Ride Armors, and all 4 Armor parts, but NONE of the Armor Chips.

In the first area of Dr. Doppler's fortress, when you reach the Ride Armor Pod, get into the K Ride Armor. Make sure your life gauge is full.

Keep moving forward until you see this place where there are bottomless pits and iron balls are being dropped from the ceiling. Get out of the Ride Armor and slide down the left wall of the first shaft. Eventually you will enter a hidden path, and reach a red Capsule. Enter it and you will receive all the Armor Chips' effects, plus a damned cool-looking GOLDEN Hyper Armor.

Chip Effects:

Body: Enhanced Protection Field. Reduces even more damage after X has taken an initial damage.

Buster: Hyper Charge. Select it on the bottom of the weapon list and you can fire the charged Buster for as long as the energy supply lasts. The energy can be regenerated by taking damage. Once it is used up, the weapon cannot be used until the energy is completely refilled. If you exit a stage, the weapon cannot be used in the next stage you enter until it is completely recharged.

Head: Life Refill. Stand still and your life gauge will be slowly regenerated. This effect works with E-tanks as well, as long as X's life is full.

Leg: Double-Dash. X can perform one more air-dash.

Megaman X3: Z-Saber for X - In second area of Doppler's fortress, the glass in the background should be intact if Vile was destroyed (otherwise it will be broken). Make it past the area filled with water and, before entering the sub-boss gate, switch to Zero.

Enter the sub-boss room and defeat the sub-boss. Make sure the final blow is dealt with Zero's Saber. (Just fully charge up, shoot it twice, wait for it to come down, then dodge and slash it.) It will slowly move up then go kamikaze on Zero.
X will then teleport in after the whole exploding sequence, and Zero will hand him the Z-Saber. To use it, just use it like when Zero was using it: Charge up to green, fire two Buster shots (still combinable), then push the attack button for the slash.

Note: With the Buster Upgrade, X can launch a sonicboom with the Z-Saber, which, if landed on an enemy that doesn't get instantly defeated, will deal extra damage on the enemy for up to 4 times. One single shockwave can take off approximately 2/3 of a boss' life, INCLUDING ALL versions of Sigma, provided that the hit did land.

MegaMan's fireball in MMX1 - Must have Heart Tanks, Sub-Tanks, enemy weapons, and power-ups. Then, go to Armored Armadillo's level. Reach the final mine cart, which makes you launch you through the air at the end of the level. Just before you reach the wall, jump up and climb the wall. At the top, there will be a large Energy Unit . Get it, and then jump into the pit and die. Repeat this step five times. On the fifth time through, a capsule will appear on that same ledge. Dr. Light will then give you a Ryu-style fireball for Mega Man to use.

Rockman: Battle And Chase - Successfully complete Megaman X, Megaman X2, and Megaman X3 to unlock Rockman: Battle And Chase.