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

The Missile Expansion is in Crossway, Chozo Ruins. To get there you need Missile Expansion, Morph Ball, Morph Ball Bomb, Charge Beam, Varia Suit, Boost Ball, Space Jump, Wave Beam, Super Missile, Spider 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 Crossway (159 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))
3. Morph Ball Bomb in Burn Dome (13 rooms; needed for Missile Expansion (Morph Ball Bomb))
4. Charge Beam in Watery Hall (7 rooms; needed for Wave Beam (Charge Beam))
5. Varia Suit in Sunchamber (7 rooms; needed for Wave Beam (Varia Suit))
6. Boost Ball in Phendrana Canyon (24 rooms; needed for Space Jump (Boost Ball))
7. Space Jump in Alcove (21 rooms; needed for Wave Beam (Space Jump Boots))
8. Wave Beam in Chapel of the Elders (21 rooms; needed for Missile Expansion (Wave Beam))
9. Super Missile in Observatory (14 rooms; needed for Spider Ball (Super Missile))
10. Spider Ball in Quarantine Cave (9 rooms; needed for Missile Expansion (Spider Ball))

Last stretch

From Quarantine Cave, door by door:

1. Quarantine Cave: go through the door to South Quarantine Tunnel → South Quarantine Tunnel (Wave Door; needs Wave Beam)
2. South Quarantine Tunnel: go through the door to Transport to Magmoor Caverns South → Transport to Magmoor Caverns South (Wave Door; needs Wave Beam)
3. Transport to Magmoor Caverns South: take the elevator → Transport to Phendrana Drifts South assumed
4. Transport to Phendrana Drifts South: go through the door to Transport Tunnel C → Transport Tunnel C (Wave Door; needs Wave Beam)
5. Transport Tunnel C: go through the door to Magmoor Workstation → Magmoor Workstation (Wave Door; needs Wave Beam)
6. Magmoor Workstation: go through the door to South Core Tunnel → South Core Tunnel
7. South Core Tunnel: go through the door to Geothermal Core → Geothermal Core (Wave Door; needs Wave Beam)
8. Geothermal Core: go through the door to North Core Tunnel → North Core Tunnel
9. North Core Tunnel: go through the door to Twin Fires → Twin Fires (Wave Door; needs Wave Beam)
10. Twin Fires: go through the door to Twin Fires Tunnel → Twin Fires Tunnel
11. Twin Fires Tunnel: go through the door to Transport to Tallon Overworld West → Transport to Tallon Overworld West
12. Transport to Tallon Overworld West: take the elevator → Transport to Magmoor Caverns East assumed
13. Transport to Magmoor Caverns East: go through the door to Transport Tunnel B → Transport Tunnel B
14. Transport Tunnel B: go through the door to Root Cave → Root Cave
15. Root Cave: go through the door to Root Tunnel → Root Tunnel
16. Root Tunnel: go through the door to Tallon Canyon → Tallon Canyon
17. Tallon Canyon: go through the door to Transport Tunnel A → Transport Tunnel A
18. Transport Tunnel A: go through the door to Transport to Chozo Ruins West → Transport to Chozo Ruins West
19. Transport to Chozo Ruins West: take the elevator → Transport to Tallon Overworld North assumed
20. Transport to Tallon Overworld North: go through the door to Ruins Entrance → Ruins Entrance
21. Ruins Entrance: go through the door to Main Plaza → Main Plaza
22. Main Plaza: go through the door to Ruined Fountain Access → Ruined Fountain Access
23. Ruined Fountain Access: go through the door to Ruined Fountain → Ruined Fountain
24. Ruined Fountain: go through the door to Arboretum Access → Arboretum Access
25. Arboretum Access: go through the door to Arboretum → Arboretum (Missile Blast Shield; needs Missile)
26. Arboretum: go through the door to Gathering Hall Access → Gathering Hall Access (Missile Blast Shield; needs Missile)
27. Gathering Hall Access: go through the door to Gathering Hall → Gathering Hall
28. Gathering Hall: go through the door to East Atrium → East Atrium
29. East Atrium: go through the door to Energy Core Access → Energy Core Access
30. Energy Core Access: go through the door to Energy Core → Energy Core
31. Energy Core: go through the door to West Furnace Access → West Furnace Access
32. West Furnace Access: go through the door to Furnace → Furnace
33. Furnace: go through Morph Ball Door to Crossway Access West → Crossway Access West (Morph Ball Door; needs Morph Ball)
34. Crossway Access West: go through the door to Crossway → Crossway (Wave Door; needs Wave Beam)

More Missile Expansions

• Missile Expansion (Burn Dome)
• Missile Expansion (Dynamo)
• Missile Expansion (Dynamo)
• Missile Expansion (Furnace)
• 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)