Low Percent Run

A Low Percent Run means collecting only the minimum required upgrades in order to complete the game. This usually involves many Sequence Breaking tricks to skip many Major Upgrades, or to skip Missile, Super Missile, or Power Bomb Expansions. Generally, no Energy Tanks are acquired if the player is going for the lowest possible percentage, however some games like Super Metroid are impossible to complete with no Energy Tanks. Some games like Metroid Zero Mission have options for ammo upgrades, as multiple of some ammo type is needed to progress. Some games may also use glitches to skip other items. These minimums are the minimums possible by humans without completely destroying the game.

Super Metroid: 14%

 * Morph Ball
 * Missiles (2)
 * Bombs
 * Super Missiles (2)
 * Ice Beam
 * Power Bombs (1)
 * Varia Suit
 * Gravity Suit
 * Charge Beam
 * Energy Tanks (3)

Metroid Zero Mission: 7%

 * Morph Ball
 * Missiles
 * Bombs
 * Unknown Items (3)
 * An extra Missile, or Screw Attack

Metroid Fusion: 0%

 * All Major Upgrades do not count towards percentage, all pickups are skipped.

Metroid Prime (GCN only): 23%

 * Space Jump Boots
 * Missile Expansion
 * Morph Ball
 * Morph Ball Bombs
 * Varia Suit
 * Wave Beam
 * Boost Ball
 * Ice Beam
 * Plasma Beam
 * Power Bombs
 * X-Ray Visor
 * Chozo Artifacts (12)

Metroid Prime 2 Echoes (GCN only): 17%

 * Missile Launcher
 * Violet Translator
 * Morph Ball
 * Bombs
 * Amber Translator
 * Space Jump Boots
 * Dark Beam
 * Light Beam
 * Dark Suit
 * Boost Ball
 * Dark Visor
 * Spider Ball
 * Power Bombs
 * Screw Attack
 * Light Suit

Metroid Prime 3 Corruption (Wii Only): 16%

 * Missile
 * Grapple Lasso
 * PED Suit
 * Energy Tank
 * Hyper Missile
 * Hyper Grapple
 * Energy Cell
 * Seeker Missile
 * Ship Grapple
 * Ship Missile Expansion
 * Screw Attack
 * Nova Beam
 * Grapple Voltage
 * X-Ray Visor
 * Plasma Beam
 * Boost Ball

Metroid Other M: 0%

 * All items are skipped in Low % runs as Hard Mode automatically removes them.