4% list updated

NOTE: This list only includes the things that absolutely must be done before item loss as well as some things that aren't strictly necessary but you definitely want to have done before item loss in order to not have a bad time after item loss.

It does not include all things that depend on the specific route you are using, but does include some major points
It does not include things that must be done pre item loss but aren't actually relevant post item loss. This is not a complete route, but is intended to be useful in determining whether you're ready for part 2.

No asterisk: Absolutely required
*1: Not required, can be crawled past/routed around, don't
*2: Route difference, depending on whether Torvus is accessed from Sanctuary, from Great Temple, or from Agon. R_Web's PB uses Agon, erubi's PB uses Sanctuary. Great Temple might not be too bad though.
*3: Route difference, depending on whether Path of Eyes is accessed from Torvus, from Great Temple, or from Landing Site. Both R_Web and erubi use Torvus. Great Temple might not be too bad and is probably better for a completion attempt. Landing Site is an option too, but much much slower than the other options and there's no point.

Key pods in following locations must be popped (none of the keys can be collected):
Battleground
Oasis
Poisoned Bog
Dungeon
Dynamo
Hive Entrance
Shrine
Reliquary
Lake

Light Suit must be unlocked:
Annihilator must be collected and equipped.
Sanctuary Energy must be returned.
Industrial Site crate must not be moved OR bridge in Industrial Site must be lowered.
Gate in Industrial Site must be lowered.
Light Suit cutscene in Main Energy Controller must not be triggered during Prelude.

Screw Attack must be unlocked:
Minigyro must not be solved.
Caretaker must be killed.
Puzzle in Watch Station must be solved
Puzzle in Vault must be solved.
Bridge in Vault must not be lowered.

Power bombs must be used in the following places:
Oasis wall
Hall of Combat Mastery tube

Yellow Blast Shields in:
Ventilation Area A
Hive Reactor
Fortress Transport Access/Training Chamber*2


Red Blast Shields in:
Mining Plaza/Save Station A*1
Mining Station A*1
Great Bridge*1
Hive Reactor
Temple Grounds Transport to Torvus Bog/Torvus Transport Access*3 (from Torvus)

Purple Blast Shields in:
Plain of Dark Worship
Phazon Grounds
Shrine Access
Transport Center *2 (From Agon)
Torvus Transport to Agon Wastes (from Agon)

Green Blast Shields in:
Torvus Temple/Temple Access*1
Torvus Temple/Underground Transport*1
Shrine Access
Warrior's Walk
Service Access*3 (from Landing Site)
Hall of Eyes-Path of Eyes*3 (from Torvus)

Violet Gates:
Temple Sanctuary
Temple Assembly Site
Industrial Site
Meeting Grounds *3 (from Great Temple)
Hive Access Tunnel *3 (from Landing Site)
Hive Transport Area *3 (from Landing Site)

Amber Gates:
Temple Sanctuary *3 (From Great Temple)
Path of Eyes *3 (from Torvus)

Emerald Gates:
Temple Sanctuary
Torvus Temple Elevator *2 (from Great Temple) *3 (from Great Temple)

Cobalt Gates:
Sanctuary Temple *1

Miscellaneous:
Light Block from in Transport C Access *3 (From Great Temple)
Light Block in Landing Site *3 (from Landing Site)
Bomb slot in Portal Station must be used. *1
Bomb slot in Transit Station must be used. *1