Where is the Missile Expansion in Gathering Hall (Metroid Prime Origins)?

The Missile Expansion is in Gathering Hall, Chozo Ruins. To get there you need Missile Expansion, Morph Ball first (starting a new game).

What you need first

Starting a new game from Landing Site, get these first, in this order, then go to Gathering Hall (17 rooms in all):

1. Missile Expansion in Landing Site (0 rooms; needed for Missile Expansion (Missile))
2. Morph Ball in Ruined Shrine (9 rooms; needed for Missile Expansion (Morph Ball))

Last stretch

From Ruined Shrine, door by door:

1. Ruined Shrine: go through the door to Ruined Shrine Access → Ruined Shrine Access
2. Ruined Shrine Access: go through the door to Main Plaza → Main Plaza (Missile Blast Shield; needs Missile)
3. Main Plaza: go through the door to Ruined Fountain Access → Ruined Fountain Access
4. Ruined Fountain Access: go through the door to Ruined Fountain → Ruined Fountain
5. Ruined Fountain: go through the door to Arboretum Access → Arboretum Access
6. Arboretum Access: go through the door to Arboretum → Arboretum (Missile Blast Shield; needs Missile)
7. Arboretum: go through the door to Gathering Hall Access → Gathering Hall Access (Missile Blast Shield; needs Missile)
8. Gathering Hall Access: go through the door to Gathering Hall → Gathering Hall

More Missile Expansions

• Missile Expansion (Burn Dome)
• Missile Expansion (Crossway)
• Missile Expansion (Dynamo)
• Missile Expansion (Dynamo)
• Missile Expansion (Furnace)
• Missile Expansion (Hive Totem)
• Missile Expansion (Main Plaza)
• Missile Expansion (Main Plaza)
• Missile Expansion (Main Plaza)
• Missile Expansion (Ruined Fountain)
• Missile Expansion (Ruined Gallery)
• Missile Expansion (Ruined Gallery)
• Missile Expansion (Ruined Nursery)
• Missile Expansion (Ruined Shrine)
• Missile Expansion (Ruined Shrine)
• Missile Expansion (Training Chamber Access)
• Missile Expansion (Vault)
• Missile Expansion (Watery Hall)
• Missile Expansion (Watery Hall Access)
• Missile Expansion (Fiery Shores)
• Missile Expansion (Storage Cavern)
• Missile Expansion (Triclops Pit)
• Missile Expansion (Elite Control Access)
• Missile Expansion (Elite Research)
• Missile Expansion (Fungal Hall Access)
• Missile Expansion (Fungal Hall B)
• Missile Expansion (Main Quarry)
• Missile Expansion (Metroid Quarantine A)
• Missile Expansion (Metroid Quarantine B)
• Missile Expansion (Phazon Processing Center)
• Missile Expansion (Security Access A)
• Missile Expansion (Frost Cave)
• Missile Expansion (Gravity Chamber)
• Missile Expansion (Ice Ruins East)
• Missile Expansion (Ice Ruins East)
• Missile Expansion (Phendrana Shorelines)
• Missile Expansion (Phendrana Shorelines)
• Missile Expansion (Quarantine Monitor)
• Missile Expansion (Research Lab Aether)
• Missile Expansion (Research Lab Hydra)