Master Key

Po Bidau Gustang offering the Master Key to Baam

The Master Key (마스터 키, Maseuteo Ki) allows for special access to the Hidden Floor.

Several rules govern this "Floor":

1. Revealing details about the Floor causes one to lose both the data they recorded as well as their memories.
2. Only Regulars can enter. (Even Family Heads are no exception.)
3. One cannot update their data or bring obtained items or goods from outside of the Hidden Floor once they have cleared the train.

Using the Master Key to enter the Hidden Floor allows Regulars to ignore the third rule, but prevents them from leaving any record.

Two keys were made and initially given to Zahard and the Hell Express conductor.

Navigation

Items

Unclassified Items Express Ticket • Suspendium • Zygaena's Flower • Key of the Tower • Bell of Dawn • Soul-Stirring Ladle • Wing Tree Badge • Hockney's Painting • Ancient Cloak For Trapping Evil • Ancient Demon's Spell Book • Test Admin Badge • Long Life Game • Karaka's Armor Suit • Eyes of De Jah • Hockney's Lantern • Zahard's Ring • Arlen's Pocket Hidden Floor Items Zahard's Bracelet • Mirror of the Past • Mirror at the End • Master Key • Good and Evil Monitor • Hidden Floor Villain Scroll • Format Pill Workshop Technology Shinsu Teleportation Device • Shinsu Warp Device • Workshop Patrol • Emile • Floating Ship • Floating Castle • Mirotic Remote Control • Sleeping Drug • Segregation Drug • Observer • Lighthouse • Pocket • Mirror at the End • Mirror of the Past • Shinsu Measuring Device • Hell Express • Stone Doll • Ignition Weapon • Sealing Device • Sealing Chamber • Bong Bong • The Rice Pot • Portal • Enna Core Upgrade Kit • Light Flowing Through The Waterfall • Ignition Liquid • Antimatter Bomb • Sealing Ship • Summoning Well • F2D-426 • R-7 • R-9 • Guide Robot • Cat Tower Green Acid • Boiling Acid • Pipes • Jump Pad • Blood Tamara • White Heavenly Mirror • Hidden Floor • Compression Flask • Light Ball Devices Section Inventory Types Arms Inventory • Armor Inventory • Reel Inventory • Pocket • Lighthouse • Great Whaley • Carrier • Manbarondenna • Pipes Armor Inventory Karaka's Armor Suit • Mule Glove Arms Inventory Rainbow Undecimber Lighthouse Eyes of God • Ha Yura's Suitcase • Opera • Enna Core Upgrade Kit Observer Little Bee • Purple Dementor • White-X • Purple Eye • Baby Growler Unclassified Device Pulley • Wand • Reel • Frog Fisher • Adam's Glove • Ancient Frog Pollack's Well • Shinsu Reactant • Good and Evil Monitor • Stealth Anklet • Flying Launcher Weapons Section Basic Weapons Types Spear • Hook • Sword • Wand • Shinsu Bomb • Needle • Shield Hooks Green April Needles Black March • Kranos • Orange Snake • Lecalicus • Cherry River Needle • Coelacanth • Leviathan (Lecalicus) Spears Mago • Great Blue Spear • Mad Shocker • Unnamed Ancient Spear • Vagnil • Flying Fish Spear • Stone General's Spear • Spear of Sphere Swords Cullinan • Donghae • Krishna • Luminous June • Narumada • Red October • Silver Moray • White Oar • Spinel • Black Mandarin Wands Jeok's Wand 13 Month Series Golden November • Dark September • White February • Silver January • Yellow May • Luminous June • Indigo July • Blue August • Red October • Colorless December • Rainbow Undecimber • Black March • Green April Compression Weapons Mago • Green April • Tiara's Quill Pen Ignition Weapons Donghae • Emile • Enryu's Thorn • Great Blue Spear • Krishna • Kranos • Lecalicus • Mad Shocker • Mago • Narumada • Vagnil • White Oar • Unnamed Ancient Spear • Coelacanth • Leviathan (Lecalicus) • Spear of Sphere • Black Mandarin Unclassified Weapons White Heavenly Mirror • Shining Fan • Sylpheed • El Robina • Essence of Bravery • Sniper Rifle • Mysterious Weapon • Boomerang Blade • Woon's Hammer • 7 Sacred Swords • 13 Month Series • Snow Blaster • Fangs of Wild Beast • Zubizarreta • Lefav Faust