Throughout Megaman X lies Sub-Tanks that save up extra energy to use it in a battle when you're running a little low, here are Vile's Sub-Tank locations.
Unlockable
How to Unlock
Boomerang Kuwanger
You will clearly see the energy tank after climbing the wall outside to the top. Use the Quick Homesick to grab the Sub-Tank.
Launch Octopus
After the second mini-boss you will see air funnels, use the third one to get to the boat, jump on the moving platform to the right and grab the tank.
Sting Chemeleon
Go to X's miniboss area and take Vile's armor through the cave, after the third hole in the ground look for a gap in the ceiling, jump out.
Storm Eagle
Go to the room where X's sub tank is, grab Vile's armor and jump on the platforms all the way to the right. Destroy the boxes in the wall.
If you pass over the X-Buster upgrade found in a Dr. Light capsule during the game, you will be rewarded later in the Sigma Fortress by gaining access to Zero's Buster, which is more powerful than the normal X-Buster upgrade. To do this, simply do not enter the Dr. Light capsule containing the X-Buster upgrade, and play the game all the way to the third Sigma level. Upon facing Vile and beating him in a battle, you will speak to Zero and he will give you his buster. This buster shoots a different third level charge shot than Dr. Light's upgrade, which is larger and more powerful.
Within the eight main levels of the game, there lies a Heart Tank or "Life Up" waiting to be discovered. Finding these items will increase your health. I shall now list each of their locations.
Unlockable
How to Unlock
Armored Armadillo's Level
At the second dozer mechaniloid, use the Storm Tornado or Fire Wave to destroy it before it demolishes the wall, then jump up the small tunnel.
Boomerang Kuwanger's Level
After you have scaled the tower and gained Kuwanger's weapon. Return to the last area of the tower and use it to retrieve it from the outer pla
Chill Penguin's Level
Venture atop the cave where the igloo-type buildings are located. Use the Fire Wave to destroy the left most building.
Flame Mammoth's Level
After you have finished Chill Penguin, in the area with all the platforms and frozen lava, go to the far right and find it under a long platform.
Launch Octopus' Level
Sink the whale battleship and crash through the shutter. Then kill the Utoboros and go into the room on the far right.
Spark Mandrill's Level
After acquiring the Boomerang Cutter, use it to snag the Heart Tank from an unreachable platform near the middle of the level in a top right corner.
Sting Chameleon's Level
Once Launch Octopus has been defeated, go the this level. Right before the cave, slide down the hole, crush the rocks, and dash over to the platform.
Storm Eagle's Level
After you have acquired the Leg Parts, ride the lifts up the the very top, then dash jump off of the lift to the left, landing on top of a building.
To find the hidden capsule to gain the Hadoken Fireball for X you have to get all Heart Tanks, Sub Tanks, Armor Parts (the arm part can be either the one from Dr. Light or the one you get from Zero in Sigma Palace 3) and beat every boss to gain there weapon. Go to Armored Armadillo's Stage and get through the whole stage without taking any damage then at the end dash off the flying platform and land above the entrance to the boss and the capsule will be there.
Mega Man Maverick Hunter X UNLOCKABLES
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