This is a guide to opening the Mantra HQ prison door in Ikebukuro for Shin Megami Tensei III HD Remaster (SMT Nocturne). Read on to learn how to open the door in Ikebukuro as well as the rewards inside!
The door can be found just after all the prisoner cells in the Mantra HQ Prison. The Prison itself is in the B1 level of the Mantra HQ Building.
Speak to the Incubus demon prisoner next to Isamu's cell, and he will direct you to the locked door.
The door can only be accessed after the Thor boss fight when you first arrive at the Mantra HQ.
After you beat the boss, players will be allowed to explore the Mantra HQ Building. Simply take the elevator or the stairs down to the basement to find the prison.
In order to open the locked door, players will need 24 points in the Strength Stat. This is base Strength which means that any bonuses from Magatamas will not be counted.
Players without 24 Base Strength will have to level-up and invest in the stat to open the door. For a tips on how to level-up quickly, visit our Best Leveling Areas page!
There will be a single Cache Cube behind the locked door. It will have the Gaea Magatama inside it. The Gaea Magatama is a good Physical Magatama which greatly resonates with the required stat to open the door. This is one of the best Magatamas to have for physical builds.
|Tips and Tricks|
|How to Get Raidou||How to Get Dante|
|How to Heal and Revive Demons||How to Recruit Demons|
|Fusion Calculator Guide||How to Farm Lucky Tickets|
|Rag's Jewelry Shop||Build Guide: Best Demi-fiend Stat Builds|
|How to Fuse Demons||Mystical Chests Guide: List of Mystical Chests|
|What is the Kagutsuchi||List of Evolving Demons|
|Best Leveling Areas||How to Unlock the Compendium|
|Joining the Mantra: Gozu's Question||List of Trophies and Achievements|
|How to Get Deathstones||How to Return to the Amala Labyrinth|
|Fiend Bosses List and Locations||How to Open All Kalpa Doors|
|Burial Chamber Guide||List of Shady Brokers|
|Junk Shop List||New Game Plus Features : How to Unlock NG+|
|Press Turn Battle System Guide||Differences Between Difficulty Settings|
|How to Swap Demons||How to Talk to Demons|
|How to Change Voice language||How to Save Game|
|How to Remove Curses||How to Farm Macca|
|Stat Guide: All Stats Explained||What Does Strength Do|
|What Does Magic Do||What Does Agility Do|
|What Does Vitality Do||What Does Luck Do|
|Where to Find Bill||Should You Release Pixie|
|Jumping from Mantra Headquarters||Demi-Fiend Canon Name|
|How to Open the Door in Ikebukuro||Four Oni Locations|
Genshin Impact Guide & Walkthrough Wiki
Elden Ring Guide & Walkthrough Wiki
Monster Hunter Rise | MHR (MH Rise) Guide & Walkthrough Wiki
Pokemon UNITE Guide & Walkthrough Wiki
Pokemon Brilliant Diamond and Shining Pearl (BDSP) Guide & Walkthrough Wiki
Yu-Gi-Oh! Master Duel Guide & Walkthrough Wiki
Animal Crossing: New Horizons (Switch) Wiki Guide
Pokémon Sword and Shield Guide & Walkthrough Wiki
Pokemon Legends: Arceus Guide & Walkthrough Wiki
Rune Factory 5 Guide & Walkthrough Wiki
©ATLUS. ©SEGA. All rights reserved. ATLUS is registered in the U.S. Patent and Trademark Office. ATLUS, the ATLUS logo, SHIN MEGAMI TENSEI, SHIN MEGAMI TENSEI NOCTURNE and SMT are either registered trademarks or trademarks of ATLUS Co., Ltd. or its affiliates.
©CAPCOM CO., LTD. All rights reserved.
The copyrights of videos of games used in our content and other intellectual property rights belong to the provider of the game.
The contents we provide on this site were created personally by members of the Game8 editorial department.
We refuse the right to reuse or repost content taken without our permission such as data or images to other sites.