Salah satu perbedaan utama antara Trails in the Sky the 3rd dan entri sebelumnya adalah adanya Memory Door. Setiap pintu berisi cerita sampingan, mini game, atau dungeon opsional. Untuk mengakses pintu-pintu ini ada beragam teka-teki yang harus kita pecahkan, bersama dengan peristiwa setelah menyelesaikan skenario.
Baca juga: Panduan Memainkan Serial Video Game Trails/Kiseki
Moon Door berisi cerita yang panjang, Sun Door memiliki mini game, dan Star Door untuk cerita sampingan yang lebih pendek.
Moon Door
Moon Door 1
- Lokasi: Jade Corridor
- Episode: Orbal Gear Project Part 1
- Syarat: Tita
- Hadiah: Long Barrel EX, 3000 Mira
- Episode: Orbal Gear Project Part 2
- Syarat: Tita, Agate
- Hadiah: Orbal Gear (Tita)
Moon Door 2
- Lokasi: Grancel Branch
- Episode: Client
- Syarat: Scherazard
- Hadiah: Heaven’s Eye (Quartz), 4000 Mira
Moon Door 3
- Lokasi: Silver Road
- Episode: Descended Wings
- Syarat: Kloe, Entrance Exam Results
- Hadiah: Falcon Eye (Quartz), 6000 Mira
Moon Door 4
- Lokasi: Saint-Croix Forest
- Episode: Departure
- Syarat: Estelle, Joshua
- Hadiah: Memory (Quartz), 8000 Mira
Moon Door 5
- Lokasi: Jenis – Old Schoolhouse
- Episode: The Happiness Stone
- Syarat: Fortune (Quartz)
- Hadiah: Happiness Stone (Accessory), 12000 Mira
Sun Door
Sun Door 1
- Lokasi: Jade Corridor
- Episode: Capua’s Delivery Service
- Syarat: Josette
- Hadiah: Detection (Quartz), Bobcat (Josette S-Craft) 3000 Mira
Sun Door 2
- Lokasi: Fisherman’s Guild
- Episode: Legendary Angler Estelle
- Syarat: Estelle
- Hadiah: Seafood Set (Monster Ingredients), 5000 Mira
- Episode: Legendary Angler Estelle – Chapter 2
- Syarat: Estelle
- Hadiah: Plate of Excellence (Recipe), 5000 Mira
- Episode: Legendary Angler Estelle – Chapter 3
- Syarat: Estelle
- Hadiah: Fisherman’s Emblem, 5000 Mira
Sun Door 3
- Lokasi: Grand Arena
- Episode: Arena
- Syarat: Zin
- Hadiah: Physical (Quartz), 5000 Mira
- Episode: Arena – Hard
- Syarat: Tournament Invitation (di dalam peti di Factory Lab)
- Hadiah: Spiritual (Quartz), 10000 Mira
- Episode: Arena – Nightmare
- Syarat: Tournament Invitation (di dalam peti di The Abyss)
- Hadiah: Soul (Quartz), 20000 Mira
Sun Door 4
- Lokasi: Labyrinth of Shadows
- Episode: The Casino – Gambler Jack
- Syarat: Destiny Card
- Hadiah: Tom Yum Goong (Sit-Down Dish), 5000 Mira
- Episode: The Casino – Gambler Jack – 2
- Syarat: Destiny Card
- Hadiah: Mirage Ring+, 10000 Mira
Sun Door 5
- Lokasi: Black Ark – Forecastle 1F
- Episode: Campanella’s Quiz Game
- Syarat: Setiap quartz level 5 di inventory
- Hadiah: Septium Bullets (Attack Food)
- Episode: Campanella’s Quiz Game – Hard
- Syarat: Setiap quartz level 5 di inventory
- Hadiah: Enigmatic Stew (Sit-Down Recipe)
- Episode: Campanella’s Quiz Game – Brutal
- Syarat: Setiap quartz level 5 di inventory
- Hadiah: Swiftness (Quartz)
Star Door
Star Door 1
- Lokasi: Grancel Castle
- Episode: Julia’s Day Off
- Syarat: Julia, Mueller
- Hadiah: Septium Vein (Quartz) 3000 Mira
Star Door 2
- Lokasi: Grancel Cathedral
- Episode: The Salt Pale
- Syarat: Menang 100 battle
- Hadiah: Petrify (Quartz)
Star Door 3
- Lokasi: Castle – Garden Terrace
- Episode: The Banquet
- Syarat: Joshua, Kloe
- Hadiah: Luxurious Lunch (Sit-Down Dish), 3500 Mira
Star Door 4
- Lokasi: Golden Road
- Episode: Journey’s End
- Syarat: Zin
- Hadiah: Yin-Yang (Quartz)
Star Door 5
- Lokasi: Balstar Channel
- Episode: Swordsmanship
- Syarat: Anelace
- Hadiah: Jinu (Sword) 5000 Mira (Anelace harus menang)
Star Door 6
- Lokasi: Grimsel Fortress
- Episode: Training, Agate Style
- Syarat: 20 resep makanan di Recipe Book
- Hadiah: Super Gladiator Headband (Accessory), 100 Mira
Star Door 7
- Lokasi: Labyrinth of Light
- Episode: The Epstein Foundation
- Hadiah: Ingenuity 2 (Quartz), 7000 Mira
Star Door 8
- Lokasi: Labyrinth of Light
- Episode: Return to the Empire
- Syarat: Oliver, Mueller
- Hadiah: Divine Eye (Quartz) 7000 Mira
Star Door 9
- Lokasi: Academy – Girls’ Dormitory
- Episode: Like a Mother
- Syarat: 50000 Mira
- Hadiah: Bloody Meatballs (Attack Food)
Star Door 10
- Lokasi: Laboratory – 2F
- Episode: Gordias-Class Experiment Report
- Syarat: Renne
- Hadiah: Pater-Mater (Renne Craft), 10000 Mira
Star Door 11
- Lokasi: Laboratory – 1F
- Episode: Phantom Thief B Report
- Syarat: Emerged Victorious
- Hadiah: Phantom Thief’s Cafe, 10000 Mira
Star Door 12
- Lokasi: Leiston Fortress – Command Center
- Episode: I Accept Your Request
- Syarat: Richard
- Hadiah: Convert (Quartz), 10000 Mira
Star Door 13
- Lokasi: Black Ark – Stern 2F
- Episode: Assault on the Imperial Guards
- Syarat: Menang 400 battle
- Hadiah: Jagd Armor, 10000 Mira
Star Door 14
- Lokasi: Black Ark – Sanctuary
- Episode: Phantasmal Blaze
- Syarat: Membuka semua pintu
- Hadiah: Brilliant Crown (Accessory)
Star Door 15
- Lokasi: The Abyss – Depths
- Episode: Paradise
- Syarat: Renne
- Hadiah: Nothingness (Quartz)
