This article is in need of research.
Reason: Currently, the information on this page comes from the Persona 4 and Persona 4 Golden guidebooks. If there is something that doesn't match gameplay, then it's due to it being wrong in the guide as well.

The Secret Laboratory is a dungeon in Persona 4. It becomes available to investigate on September 16th after Naoto Shirogane goes missing and must be completed by October 5th.

Investigation

After Naoto goes missing, the following must be done before the player can access the Secret Laboratory:

  • Speak with the female student in front of classroom 1-1 at Yasogami High School.
  • Speak with the police officer in the Northern Shopping District on Monday, Wednesday or Friday.
  • Speak with Chie Satonaka at the Samegawa Flood Plain Riverbank.
  • Speak with the police officer in the Northern Shopping District again.
  • Speak with the housewife in front of the shrine.
  • Speak with the police officer in the Southern Central Shopping District on Tuesday, Thursday or Saturday. While speaking with him, select these dialogue options:
    • "Has an obsession with the case."
    • "They consider him a child."

The earliest possible date that the Secret Laboratory can be properly accessed is September 17th.

Persona 4 Gameplay

Maps

  • The entrance map is called the Secret Laboratory Entrance
  • Each map is called a basement floor and they are numbered B1F through B9F
  • Fixed Layouts: B4F (Mini-Boss), B6F, and B9F (Boss)

Encounters

Name Arcana Level Notes
Rainy Brother 1
Strength
44
Rain Spawn
Rainy Sister 1
Chariot
44
Rain Spawn
Insolent Basalt
Chariot
45
Source Basalt
Strength
45
Constancy Relic
Empress
46
Flattering Hablerie
Magician
47
Inviting Nyogo
Strength
47
Royal Dancer
Lovers
47
Flowing Sand
Fortune
47
Red Sigil
Hierophant
48
Rainbow Twins
Hierophant
48
Rain Spawn
Dogmatic Tower
Hierophant
48
Dismayed Panzer
Chariot
48
Shallow Okina
Hermit
49
Furious Gigas
Strength
50
Opulent Hand
Magician
50
Rare Spawn
Mighty Beast
Strength
50
Raindrop Musha
Strength
51
Rain Spawn
Chaos Fuzz
Hierophant
51
Wild Drive
Chariot
51
World Balance
Fortune
52
Fail Gene
Fortune
52
Immoral Snake
Lovers
52
Mach Wheel
Chariot
52
Order Giant
Justice
53
Wicked Turret
Chariot
53
Mind Dice
Fortune
53
Fierce Cyclops
Hanged Man
53
Truth Pesce
Priestess
53
Power Castle
Emperor
54
Jotun of Power
Hanged Man
54
Elegant Mother
Empress
54
Hell Knight
Emperor
55
Dominating Machine
Justice
57

Bosses

Name Arcana Level Notes
Dominating Machine (Mini-Boss)
Justice
53
Mini-Boss
Shadow Naoto
Fortune
55
Boss
Extreme Vessel
Chariot
57
Optional Boss. Oct 12th onwards.

Shuffle Time: Personas

  This section is a stub. You can help Megami Tensei Wiki by expanding it.
Reason: Missing floors
Level Arcana Persona Area(s)
34 Empress Gorgon ?
34 Moon Yamata-no-Orochi ?
34 Emperor Setanta ?
36 Hierophant Flauros ?
36 Death Samael ?
37 Priestess Parvati ?
37 Devil Pazuzu ?
38 Justice Dominion ?
39 Hanged Orthrus ?
39 Magician Dis ?
40 Temperance Genbu ?
40 Sun Yatagarasu ?
41 Emperor Okuninushi ?
41 Moon Alraune ?
41 Hermit Hitokoto-Nushi ?
42 Strength Hanuman ?
43 Chariot Triglav ?
43 Star Fuu-Ki ?
44 Devil Succubus ?
44 Empress Gabriel ?
45 Hierophant Hokuto Seikun ?
45 Emperor Thoth ?
46 Fool Decarabia ?
46 Death Mot ?
47 Magician Rangda ?
47 Temperance Seiryu ?
47 Sun Narasimha ?
48 Priestess Kikuri-Hime ?
48 Moon Girimehkala ?
48 Hermit Kurama Tengu ?
49 Justice Throne ?
50 Strength Kali ?
50 Star Ganesha ?
51 Emperor Pabilsag ?
52 Hierophant Cerberus ?
52 Empress Skadi ?

Items

  This section is a stub. You can help Megami Tensei Wiki by expanding it.
Reason: Missing floors

Normal Chests

Item Location
Amrita Soda
?
Purifying Salt
?
Purifying Water
?
Goho-M
?
Assault Signal
?
Cyclone Magatama
?
Hell Magatama
?
Diamond Shield
?
San-zun Tama
?
Revival Bead
?
Arc Magatama
?
Curse Paper
?
Super Sonic
?
Snuff Soul
?
Segaki Rice
?
Soul Drop
?
Chest Key
?
Tesla Coil
?
Dry Ice
?
Vanish Ball
?
Peach Seed
?
Balm of Life
?
Hiranya
?
Smart Bomb
?
Physical Mirror
?
Homunculus
?
Life Stone
?
Magic Mirror
?
Yashichi
?
Frost Magatama
?

Locked Chests

Item Location
Death Scudetto
?
Red Battlesuit
?
Peach Battlesuit
?
Amaterasu Fob
?
Storm Vow
?
Storm Pin
?
Safety Belt
?
Disguise Mask
?
Wind Suppressor
?
Patient Collar
?
Spirit Hachimaki
?
Steed Strap
?
Cool Beads
?
Black Cat Charm
?
Ice Suppressor
?
Sigma Drive
?
Blessed Hands
?
Disinfectant
?
Falcon Eye
?
Black Feather
?
Moon Potpourri
?
Earth Badge
?
Awareness Note
?
Iron Charm
?
White Feather
?
Sorcerer's Mark
?
Volt Vow
?
Volt Pin
?
Fire Suppressor
?
Blizzard Vow
?
Blizzard Pin
?
Tranquil Buddha
?
Healthy Recipe
?
Reprisal Chain
?
Blaze Vow
?
Blaze Pin
?
Maneki Neko
?
Book of Serenity
?
Bravery Vessel
?
Volt Suppressor
?
Ryumyaku Brace
?
Kid's Hachimaki
?
Soma
?
Soul Food
?
Chewing Soul
?
Bead
?
Bead Chain
?

Persona 4 Golden Gameplay

Maps

  • The entrance map is called the Secret Laboratory Entrance
  • Each map is called a basement floor and they are numbered B1F through B9F
  • Fixed Layouts: B4F (Mini-Boss), B6F, and B9F (Boss)

Encounters

Name Arcana Level Notes
Rainy Brother 1
Strength
44
Rain Spawn
Rainy Sister 1
Chariot
44
Rain Spawn
Insolent Basalt
Chariot
45
Source Basalt
Strength
45
Constancy Relic
Empress
46
Flattering Hablerie
Magician
47
Inviting Nyogo
Strength
47
Royal Dancer
Lovers
47
Flowing Sand
Fortune
47
Red Sigil
Hierophant
48
Rainbow Twins
Hierophant
48
Rain Spawn
Dogmatic Tower
Hierophant
48
Dismayed Panzer
Chariot
48
Shallow Okina
Hermit
49
Furious Gigas
Strength
50
Opulent Hand
Magician
50
Rare Spawn
Mighty Beast
Strength
50
Raindrop Musha
Strength
51
Rain Spawn
Chaos Fuzz
Hierophant
51
Wild Drive
Chariot
51
World Balance
Fortune
52
Fail Gene
Fortune
52
Immoral Snake
Lovers
52
Mach Wheel
Chariot
52
Order Giant
Justice
53
Wicked Turret
Chariot
53
Mind Dice
Fortune
53
Fierce Cyclops
Hanged Man
53
Truth Pesce
Priestess
53
Power Castle
Emperor
54
Jotun of Power
Hanged Man
54
Elegant Mother
Empress
54
Hell Knight
Emperor
55
Dominating Machine
Justice
57

Bosses

Name Arcana Level Notes
Dominating Machine (Mini-Boss)
Justice
53
Mini-Boss
Shadow Naoto
Fortune
55
Boss
Extreme Vessel
Chariot
57
Optional Boss. Oct 12th onwards.

Shuffle Time: Skill Cards

Rank Area(s) Skill Cards
3 1-8 Assault Dive, Kill Rush, Twin Shot, Gale Slash, Rampage, Swift Strike, Cell Breaker, Brain Shake, Agilao, Bufula, Zionga, Garula, Mahama, Mamudo, Poison Mist, Tentarafoo, Valiant Dance, Foolish Whisper, Evil Smile, Old One, Anima Freeze, Media, Me Patra, Recarm, Fire Break, Ice Break, Wind Break, Elec Break, Dodge Physical, Dodge Fire, Dodge Ice, Dodge Wind, Dodge Elec, Fire Boost, Ice Boost, Elec Boost, Wind Boost, Counter, Regenerate 1, Invigorate 1, Growth 1, Apt Pupil
4 1-8 Power Slash, Cruel Attack, Crazy Chain, Mind Slice, Seal Bomb, Megido, Life Drain, Spirit Drain, Stagnant Air, Diarama, Matarunda, Masukunda, Marakunda, Dekunda, Matarukaja, Masukukaja, Marakukaja, Dekaja, Revolution, Red Wall, White Wall, Blue Wall, Green Wall, Trafuri, Null Poison, Null Dizzy, Fast Heal
5 1-8 Fatal End, Black Spot, Mighty Swing, Herculean Strike, Heat Wave, Atom Smasher, Maragion, Mabufula, Mazionga, Magarula, Amrita, Resist Fire, Resist Ice, Resist Elec, Resist Wind, Survive Light, Survive Dark, Evade Physical, Evade Fire, Evade Ice, Evade Wind, Evade Elec, Counterstrike, Growth 2
6 1-8 Torrent Shot, Vicious Strike, Blade of Fury, Aeon Rain, Poison Arrow, Mustard Bomb, Navas Nebula, Agidyne, Bufudyne, Ziodyne, Garudyne, Hamaon, Mudoon, Diarahan, Mediarama, Energy Shower, Samarecarm, Resist Physical, Endure Light, Endure Dark, Hama Boost, Mudo Boost, High Counter, Regenerate 2, Invigorate 2, Divine Grace, Cool Breeze
7 3-8 Gigantic Fist, Tempest Slash, Deathbound, Arrow Rain, Virus Wave, Maragidyne, Mabufudyne, Maziodyne, Magarudyne, Mahamaon, Mamudoon, Ghastly Wail, Tetraja, Endure, Fire Amp, Ice Amp, Elec Amp, Wind Amp, Ailment Boost, Auto-Tarukaja, Auto-Rakukaja, Auto-Sukukaja, Firm Stance

Shuffle Time: Personas

Level Arcana Persona Area(s)
34 Empress Gorgon B1+
34 Moon Yamata-no-Orochi
34 Emperor Setanta
36 Hierophant Flauros
36 Death Samael
37 Priestess Parvati
37 Devil Pazuzu
38 Justice Dominion
39 Hanged Orthrus
39 Magician Dis
40 Temperance Genbu
40 Sun Yatagarasu
41 Emperor Okuninushi
41 Moon Alraune
41 Hermit Hitokoto-Nushi
42 Strength Hanuman
43 Chariot Triglav
43 Star Fuu-Ki
44 Devil Succubus
44 Empress Gabriel
45 Hierophant Hokuto Seikun
45 Emperor Thoth
46 Fool Decarabia B3+
46 Death Mot
47 Magician Rangda
47 Temperance Seiryu
47 Sun Narasimha
48 Priestess Kikuri-Hime
48 Moon Girimehkala
48 Hermit Kurama Tengu
49 Justice Throne B3+
(Excluding B5)
50 Strength Kali B7+
50 Star Ganesha
51 Emperor Pabilsag
52 Hierophant Cerberus
52 Empress Skadi

Items

  This section is a stub. You can help Megami Tensei Wiki by expanding it.
Reason: Missing some floors

Normal Chests

Item Location
  Amrita Soda
BF 3, 7
  Purifying Salt
BF 1, 5
  Purifying Water
BF 4, 8
  Assault Signal
BF 1, 5
  Cyclone Magatama
BF 2, 6
  Hell Magatama
BF 1, 5
  Diamond Shield
BF 3, 7
  San-zun Tama
BF 2, 6
  Arc Magatama
BF 4, 8
  Curse Paper
BF 4, 8
  Super Sonic
BF 2, 6
  Snuff Soul
BF 1-8
  Segaki Rice
BF 3, 7
  Soul Drop
BF 1-8
  Tesla Coil
BF 1, 5
  Dry Ice
BF 3, 7
  Balm of Life
BF 2, 6
  Hiranya
BF 4, 8
  Smart Bomb
BF 2, 6
  Physical Mirror
BF 4, 8
  Homunculus
BF 1-8
  Life Stone
BF 1-8
  Magic Mirror
BF 3, 7
  Yashichi
BF 4, 8
  Frost Magatama
BF 3, 7

Locked Chests

Item Location
  Red Battlesuit
BF 1, 2, 7, 8
  Amaterasu Fob
BF 5
  Storm Vow
BF 2, 7
  Storm Pin
BF 7
  Safety Belt
BF 1
  Volt Suppressor
BF 1, 8
  Wind Suppressor
BF 2, 7
  Cool Beads
BF 2, 7
  Black Cat Charm
BF 5
  Sigma Drive
BF 2, 7
  Steed Strap
BF 2
  Disinfectant
BF 2
  Soul Food
BF 8
  Falcon Eye
BF 2, 7
  Earth Badge
BF 5
  Chewing Soul
BF 2, 7
  Awareness Note
BF 1, 8
  Death Scudetto
BF 2, 8
  White Feather
BF 5
  Volt Vow
BF 1, 8
  Volt Pin
BF 8
  Fire Suppressor
BF 5
  Healthy Recipe
BF 5
  Bead
BF 1
  Bead Chain
BF 5
  Blaze Vow
BF 5
  Maneki Neko
BF 1, 8
  Peach Battlesuit
BF 1, 7
  Bravery Vessel
BF 1
  Black Feather
?
  Blaze Pin
?
  Blessed Hands
?
  Blizzard Vow
?
  Book of Serenity
?
  Disguise Mask
?
  Ice Suppressor
?
  Iron Charm
?
  Moon Potpourri
?
  Patient Collar
?
  Reprisal Chain
?
  Ryumyaku Brace
?
  Sorcerer's Mark
?
  Spirit Hachimaki
?
  Tranquil Buddha
?

Game Appearances

Persona 4

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No reason provided.

Anime Appearances

Persona 4 The Animation

  This section is a stub. You can help Megami Tensei Wiki by expanding it.
No reason provided.

Manga Appearances

Persona 4

  This section is a stub. You can help Megami Tensei Wiki by expanding it.
No reason provided.

Stage Play Appearances

Visualive Persona 4: The Evolution

Nomenclature

Names in Other Languages
Language Name Meaning
  Japanese 秘密結社改造ラボ Secret Society Remodeling Lab

References

General
  • "Chaoter 5: Dungeon", Persona 4 Official Perfect Guide, Famitsu Editorial Staff. Published by Enterbrain (2008). Japanese. p. 172-262. ISBN-13: 978-4757744561.
  • "Chapter 4: Dungeon", Persona 4 The Golden: The Complete Guide, Compiled by the Dengeki Playstation Editorial Department. Published by ASCII Media Works (2012). Japanese. p. 208-310. ISBN-13: 978-4048866637.