The Energy Tank is a common Suit Expansion in the Metroid series, featured in every Metroid game to date. The Energy Tank is used to increase Samus's maximum energy by 100 units (with the exception of Hard Mode in Metroid: Zero Mission, where each Tank increases Energy by 50). They also refill Samus's energy to full upon acquisition. Extra Energy Tanks are represented by small boxes near the top of the HUD. These, like other expansions, are not required to progress through the games' plots, thus creating two challenges: completing the game with all the Energy Tanks acquired, and completing the game with the least amount of Tanks possible acquired.
Samus must use her Morph Ball and Morph Ball Bombs to crawl through a tunnel in the ceiling of the room where the first Chozo Statue of the game resides; the Tank is at the end of the tunnel.
After obtaining the Varia Suit, Samus must travel backwards to a corridor filled with acid, then access a tunnel down under the acid; the Tank resides at the end of the tunnel.
After ending Kraid and obtaining the Speed Booster, Samus must travel to a corridor with several bugs flying around. She must then Shinespark through several blocks that block access to the Tank.
While traveling through Ridley's lair, Samus encounters this Tank sitting plainly at the end of the corridor. However, the path to the Tank is lined with fake blocks, so Samus must tread carefully to reach it.
After defeating Ridley, Samus must travel to a corridor with pipes that send out bugs, then lay a Morph Ball Bomb near the entrance of the corridor to access a network of tunnels; the Tank is at the end of the tunnel.
Samus must travel to the room outside Mecha Ridley's room, then build up enough speed to break through a set of blocks in the room to the left. She will then be able to access the Tank, but only if she succeeds in bypassing tripwire lasers.
Samus must travel to the glass tunnel that connects the Mothership with the Chozo-built portion of Chozodia, then lay a Power Bomb to break the glass, then exit through the bottom left after laying another Power Bomb to break open the wall. She must then drop down a hole, then travel to the left. Finally, she must Shinespark up through a narrow corridor until she hits the Tank.
Samus must travel to the room adjacent to the room that holds the Ruins Test, then exit through the bottom right. She must then use her Speed Booster cleverly to keep enough charge through several rooms while traveling to the right, eventually reaching a platform where she must Shinespark to reach the Expansion.
After defeating the Hive Mecha and obtaining the Missile Launcher, Samus must destroy the Missile Door Lock with a Missile to access the Transport Access North; the Tank sits plainly inside.
Samus must shoot the white-colored lock in the room with her Ice Beam, then enter the Chozo Statue's hands in Morph Ball mode. The statue rolls Samus into a small chamber with the Tank.
After defeating the Chozo Ghosts located in the Training Chamber, Samus must use a Half-pipe in conjunction with her Boost Ball to activate a Bomb Slot high up in the room. This activates an elevator that leads up to a set of Spider Ball Tracks that leads to the Tank.
When Samus rolls through the tunnel to access Phendrana Drifts, she must use a double bomb jump three times to climb up to this Tank high up in the network of tunnels.
Samus must activate three conduits using the Wave Beam along with the Thermal Visor. After activating the third one, she must roll through to a small chamber; the Tank is inside.
Samus must activate two Bomb Slots to restore power to a Spinner, then activate the Spinner using her Boost Ball, thus raising the water level. She must then jump across the ice floes using her Space Jump Boots, accessing a platform with a tunnel she must enter as Morph Ball. The Tank is at the end of the tunnel.
Samus must lay a Power Bomb to destroy a grate in front of a fan, then activate a terminal with her Scan Visor to turn on a fan. This blows a large number of Puffers into another fan, revealing the Tank.
After defeating the Omega Pirate, Samus must exit the Elite Quarters through a Red Door on the upper level of the room. The Tank is in plain sight once she enters the Processing Center Access.
Samus must travel to the Temple Assembly Site, then destroy a Red Blast Shield on the door to Storage Cavern B with a Missile. The Tank sits inside the Storage Cavern.
Samus must travel to the Path of Eyes, use her Light Beam to move a pillar, then open a Green Blast Shield with a Super Missile. She must then enter the Windchamber Gateway, then activate a Kinetic Orb Cannon and use it. From there, she must use her Grapple Beam to swing across to the Tank.
After defeating the Bomb Guardian and recoveriing her Morph Ball Bomb ability, Samus must return to this room, then use her Bomb ability to break a block that prevents access to a Kinetic Orb Cannon. Entering the Cannon launches Samus up to a small portion of the room that holds the Tank.
Samus must energize the storage racks in the room, then position them so that she can jump up to the south side of the room on them by using her Space Jump Boots. The Tank sits on a platform at the top of the south side of the room.
After obtaining the Dark Beam, Samus must travel to the Agon Temple and open the Black Door to the west with the Dark Beam. Once she enters the Mine Shaft, she must use her Morph Ball Bombs to climb through the tunnels until she reaches the Tank.
Samus must climb up to the statue of Amorbis in the middle of the room, then switch on her Echo Visor. She must then shoot three sonic emitters, lining up all three lenses and revealing the Tank. To reach the Tank, she must Screw Attack across from a high point very carefully.
Samus must use her Morph Ball Bombs to activate a series of underwater Bomb Slots, moving a stream of water that pushes upward to directly below the Tank. She must then Bomb Jump up to the Tank.
After obtaining the Boost and Spider Ball upgrades, Samus must travel to Torvus Plaza, then use her Boost Ball to gain speed on a Half-pipe until she reaches a set of Spider Ball Tracks. She must follow the Tracks, dodging a Sporb along the way, until she reaches a Kinetic Orb Cannon. The Cannon launches her over to an area of the room where the Tank resides.
Samus must Screw Attack from the Portal located in the Meditation Vista to a platform far out in the distance. The platform eventually passes under the Tank.
Samus must use a Kinetic Orb Cannon to launch up to a magnetically charged sphere that she can travel on using her Spider Ball. She must then use her Boost Ball to propel herself from sphere to sphere, eventually arriving at the Tank.
When Samus is rolling through maintenance tunnels during the Space Pirate attack on the Olympus, it is impossible to avoid acquiring the Tank. This is so that Samus always has an Energy Tank to inject when entering Hypermode
When Samus enters the Substation East, the only way to proceed to her objective is through a narrow tunnel; the Tank is inside the tunnel and is also impossible to avoid.
Samus must release both locks in the Gateway room, then head to the split path Morph Ball tunnel, then roll to the right. Several Hoppers attack her. After defeating the Hoppers, Samus must enter the door to the Reliquary II, where the Tank sits.
Samus must destroy a section of the wall covered in crystallized Fuel Gel inside the Overgrown Ruins. She must then enter the now-uncovered door leading to the Vault; the Tank sits inside.
Samus must use a Spinner to create a bridge in this room, effectively bridging the Cliffside and Thorn Jungle regions of Bryyo. She must walk onto the bridge, then use a pair of Wall Jump Surfaces to climb up to the Tank.
Samus must jump up to a high ledge using a Grab Ledge found there, then activate a Kinetic Orb Cannon with her newly found Boost Ball. The Cannon launches her over to a small platform, with the Tank on a nearby ledge.
Samus must obtain the Seeker Missile, then return to the Xenoresearch A Lift. The Tank, which was previously guarded by an energy shield, is now sitting ready for the taking.
After obtaining the Spider Ball, Samus must cross the Zipline Station on a set of Spider Ball Tracks as the Zipline Cables there have become inoperable. Along the set of Tracks is a concealed section that holds the Tank.
After defeating the Metroid Hatcher located in the Metroid Creche, Samus must launch herself up to a tunnel, then follow that to a set of Spider Ball Tracks. Following the Tracks leads to a tunnel with the Tank at the end.
Samus must access the Port Observation Deck by way of the Auxiliary Lift, then insert an Energy Cell into an empty slot there. This opens a door to Junction A, from where Samus must access the Munitions Locker, where the Tank resides peacfully.
Samus must travel to her ship's Landing Site, then travel to the left two rooms. She must then use her Morph Ball Bombs to blow a hole open in the wall, granting access to a small chamber that holds the Tank.
Samus must use her Speed Booster to Shinespark through the upper left wall at her ship's Landing Site, then proceed to the left until she reaches the Tank.
After defeating Kraid, Samus must travel to the elevator that leads to Norfair, then travel to the right, using a Super Missile to break through the wall. She must then drop down a shaft and enter a previously sealed door. The Tank sits hidden inside the ceiling.
Samus must travel to the bottom of the large green shaft, then lay a Power Bomb and drop through the floor, exiting through the door found there. She must travel along the corridor until she reaches the Tank, being careful to avoid a hole in front of the Tank.
Samus must travel to the shaft nearby the first Missile Expansion in the game, then exit through the upper right. She must then shoot a hole in the ceiling at the right side of the chamber to reveal the Tank. She can reach it with the Hi-Jump Boots or Space Jump, or Bomb Jump up to the top of the ceiling.
Samus must travel to a purple shaft with snowflakes in the background, then open a Yellow Door there with a Power Bomb. She must then travel up the shaft inside, either by Wall Jumping or by using the Grappling Beam, then open a shutter at the top with the Wave Beam. This opens a door at the ground level. Samus must go through the door to acquire the Tank.
Samus must travel to the room that contains the Charge Beam, then destroy the floor with a Power Bomb, dropping down and exiting through the next door. She then finds a large corridor filled with water. She must then use her Speed Booster to Shinespark through the upper left corner of the room, revealing the Tank. The Gravity Suit helps immensely with moving underwater to acquire this Tank, but it is possible without the Gravity Suit.
After Crocomire meets his end and Samus obtains the Grappling Beam, she must return to Crocomire's lair, then use a set of Grappling Beam Blocks in the lair to access the Tank in the upper right of the room.
After escaping a shaft that fills slowly with lava, Samus must travel to the right, then destroy a dragon's head with a Power Bomb. She must then drop down a shaft hidden behind the head, all the way to the bottom right, where the Tank awaits.
After her duel with Ridley, Samus must travel back to his lair, then exit through the left side. She finds a room that holds the capsule the Metroid Hatchling once resided in. The Tank is hidden in the floor directly in front of the capsule.
Samus must travel to the right portion of the ship, near the exit to Crateria, then shoot a hole in the roof and go through the door there. She must then traverse a flooded corridor using the Gravity Suit and Grappling Beam, eventually discovering the Tank on the left side of the room.
After defeating Botwoon, Samus must exit its lair through the bottom right. She must then find a hidden tunnel in the ceiling that eventually leads to the Tank.