These are the items that appeared in Sector 3 / Pyrosphere.
Adam will authorize the Varia Suit after Samus reaches the top of the Crater Interior.
The Super Missile is authorized in the Geothermal Power Plant. After looking for the exit and being trapped, Samus looks for the magma-eruption port. After finding it, Adam will authorize Super Missiles to activate it.
After destroying the magma-eruption port, Samus will be authorized to use the Plasma Beam to defeat Ridley.
In plain sight atop the stairwell just before the Geothermal Power Plant.
Energy Part 1Edit
After the Vorash attempts to eat Samus at the start of her trek through the Pyrosphere, she must proceed into the next darkened room and find a ledge illuminated by several Pow, then roll through a network of tunnels beside the Pow. The Part is at the end.
Energy Part 2Edit
Energy Part 3Edit
Just before entering the Crater Interior, Samus must roll into the small Morph Ball hatch on the right of the room above and navigate through the floor to find this Part. It may be helpful for withstanding the heat until the Varia Suit is authorized.
Energy Part 4Edit
On the other side of a lava-filled room Samus was initially unable to cross due to lack of Grapple Beam, she can jump off the side of the platform into a small tunnel, which has the Part at the end.
Energy Part 5Edit
In the room where Anthony was threatened by a Rhedogian, Samus must dismantle a Super Missile blast shield (opposite the Power Bomb one) and activate the terminal inside. This will open a hatch high up on the other side of the room and summon a second Grapple Point for Samus to use. The Part is in the opened chamber.
Missile Tank 1Edit
Samus will come across a sand-filled corridor inhabited by Dessgeegas which also contains numerous heat exhaust vents that shut on and off. Samus must freeze the one that never shuts off and climb inside, then bomb a small crate.
Missile Tanks 2 and 3Edit
In the Floor Observation Room, Samus must roll under the staircase to the raised platform at the back to find this Tank. In the hall directly outside, she must find a hatch in the wall and roll through a tunnel to find the second Tank, again in the Observation Room.
Missile Tank 4Edit
During the Morph Ball portion of the Desert Refinery ascension, Samus will find that the tunnel branches. The Tank is off to the right.
Missile Tank 5Edit
Samus must descend the shaft after the Ridley battle until she finds a tunnel in the left wall, leading to this mysteriously-placed Tank.
Missile Tank 6Edit
Missile Tank 7Edit
Samus must clear out the robotic generators in the penultimate corridor before the Geothermal Power Plant and build up a run. She must run through to the room before this (not the one before the Plant) and Shinespark up the ceiling. As she falls, she must Space Jump to the right corner.
Missile Tank 8Edit
In the darkened room connecting to the large main area (which also contains an Energy Part), Samus must blast open the shield on the ramp leading to the lower part of the lava cavern, and then enter the opening to find the Tank ahead.
Missile Tank 9Edit
Back at the top of the glass hallway ruined after the Vorash attack, Samus must spot a sensor outside and shoot it with the Wave Beam. This will open a hatch in the floor, with the Tank at the end of a tunnel under the hallway.
Missile Tank 10Edit
The Pow can help to indicate the location of this item. Samus must go to the northeast area of the massive lava ocean area and use a Power Bomb to destroy several stalagmites. One of these contains the Tank.
Missile Tanks 11 and 12Edit
Descending the first shaft after the Navigation Booth, Samus must Space Jump across the lava pond to find the Tank on a platform further on. In another shaft nearby, Samus must blast open a Super Missile shield at the top and climb up.
Missile Tank 13Edit
This Tank is in plain view in a room in the experimental simulated desert area. This room is most infamous for being home to the Pyrosphere Door Glitch. Samus can Space Jump down to the Tank in its alcove.
Accel Charge 1Edit
In the same room where Adam authorizes the Ice Beam, Samus must examine the three pods on the ground. Destroying the one closest to the Fly Pod will reveal a Morph Ball launcher. The launcher will fire Samus up to a hidden chamber in the ceiling, in which the Charge resides.