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

The Missile Expansion is in Furnace, 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 Furnace (22 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
9. Gathering Hall: go through the door to East Atrium → East Atrium
10. East Atrium: go through the door to Energy Core Access → Energy Core Access
11. Energy Core Access: go through the door to Energy Core → Energy Core
12. Energy Core: go through the door to West Furnace Access → West Furnace Access
13. West Furnace Access: go through the door to Furnace → Furnace

Also in Furnace

• Energy Tank

More Missile Expansions

• Missile Expansion (Burn Dome)
• Missile Expansion (Crossway)
• Missile Expansion (Dynamo)
• Missile Expansion (Dynamo)
• Missile Expansion (Gathering Hall)
• 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)