Secret Floors Guide (Hidden Chambers)

Enter the Gungeon has a hidden chamber between each main floor (1.5 through 4.5). Defeating any secret floor boss flawlessly does not reward a Патрон Мастера. This guide covers the requirements, step-by-step access, important notes, and first-visit rewards for each one.

Oubliette

Located between Цитадель Свинцового Властелина and Собственно Оружелье. Sewer-style layout full of garbage bags, toxic puddles, and harmless Патронщик variants.

Cost: 2 keys (or Надежные отмычки / Бур as substitutes)

Steps to enter

1. Цитадель Свинцового Властелина always contains a fireplace room — find the blue water barrel inside or in an adjacent room
2. Push the barrel next to the fireplace to extinguish the flames
3. Crawl into the fireplace and interact with the hidden switch
4. A hidden room with a trapdoor appears on the map — the trapdoor has two locks, each costing 1 key (2 total); Надежные отмычки or a Бур can substitute for normal keys

Notes

• Water barrels are fragile — enemy attacks and explosions destroy them, so position carefully during room clear
• If the barrel is gone, use Мега-тушитель, Утечка хладагента
• After your first visit, the water barrel usually spawns inside or directly adjacent to the fireplace room on all future runs

Rewards and unlocks

• A small fixed room inside the Oubliette always contains the Старый значок, required for the Аббатство Истинной Пушки
• First visit unlocks Хламопушка

Аббатство Истинной Пушки

Located between Собственно Оружелье and Черная Пороховая Шахта. Gothic monastery aesthetic with stronger enemies than the surface floors.

Cost: must first complete the Oubliette and retrieve the Старый значок

Steps to enter

1. Pick up the Старый значок from its fixed room inside the Oubliette — it occupies an armor slot and disappears the moment you take any damage
2. Carry the Старый значок through the rest of the Oubliette and all of Собственно Оружелье without being hit
3. Find the altar room on Собственно Оружелье — it contains seven large bullet warrior statues and looks one cell larger than a normal room on the map; it tends to appear near a shop or chest room
4. Place the Старый значок on the altar to open a staircase leading into the Аббатство Истинной Пушки

Notes

• Any hit destroys the Старый значок — if you're already low on health when entering the Oubliette, consider whether the escort is realistic
• Some rooms inside the Аббатство Истинной Пушки contain permanently Jammed enemies regardless of your Curse level — they deal and take significantly more damage
• The Аббатство Истинной Пушки always has a hidden room containing Искатель истины – Брат Альберн; opening his chest yields Ложь. This room spawns independently from normal secret room generation, so multiple secret rooms in one Аббатство Истинной Пушки run are common

Rewards and unlocks

• Boss drops both a normal boss reward and a Synergy Chest
• Simply entering for the first time unlocks Кровавая брошь and the "Reverence for the Dead" achievement — you do not need to clear the floor

Resourceful Rat's Lair

Located between Черная Пороховая Шахта and Hollow. Mine tunnel layout with no shops and no normal chest rooms. The most complex prerequisites — plan ahead across multiple runs.

Cost: Обглоданный ключ + 1 Ключ + 2 Пустышкаs (the Ключ can be swapped for Скелетроновый ключ, АКлюч-47, or Надежные отмычки; the Обглоданный ключ has no substitute)

Preparation

• Hard prerequisite: the Обглоданный ключ does not spawn in the shop at all until you have built the Пуля, убивающая прошлое. You have to finish the four-component run in Bullet That Can Kill the Past Guide before this route opens up
• The Обглоданный ключ first appears in a Собственно Оружелье shop for 1000 Гильзы; payment can be made in installments across runs, and once paid in full it costs 115 Гильзы on every later run. Discount items never lower its price
• The Обглоданный ключ can be stolen, but not with Цепкий крюк or the Геймпад hook (see How to Steal from Shops); if stolen before it has been paid off once, it returns next run at the price it was at
• Six Записка, приводящая в ярость are scattered throughout all floors of Enter the Gungeon and appear randomly each run — pick them up whenever they show up. Each note ends with a cheese-wedge arrow indicating one direction in the maze; the more notes you have collected, the more of the correct sequence you know before entering the Lair

Steps to enter

1. On Черная Пороховая Шахта, find a room with 2–4 rats running on the ground and clear it
2. Reveal the hidden trapdoor by walking repeatedly over suspicious floor tiles (a larger-than-normal dust cloud marks the right tile), spraying liquid on the ground, or using a Пустышка anywhere in the room — short-range blank effects like Пуля-пустышка won't work, and the trapdoor never spawns in a shop room
3. Open the trapdoor with a Ключ and drop in
4. Walk along the minecart tracks to the end — do not ride the minecart (riding teleports you backwards repeatedly; walking is faster)
5. Use one Пустышка at the dead end to open the first hidden passage. If you have Доспехи, deliberately falling into the nearby pit reveals this passage too, saving a Пустышка
6. Walk to the next dead end and use a second Пустышка to open the second hidden passage. This one counts as a separate room with no pit, so the second Пустышка cannot be saved unless you have another way to hurt yourself
7. Open the final hatch with the Обглоданный ключ to enter the Lair

Notes

• Окровавленный шарф lets you teleport past both hidden passages, skipping both Пустышкаs
• The Lair shows only a rat-holding-cheese animation instead of a real map
• Candle-carrying rats wander the floors — harmless normally (they die on contact and sometimes drop Гильзы), but become Jammed and deal contact damage if you carry any Curse
• The maze is a sequence of six rooms, each with a choice of exit direction. Wrong once: sent back to the previous room. Wrong twice: elevator to the Hollow, ending your Lair run
• The correct sequence is fixed per save file and stays the same forever once discovered

Rewards and unlocks

• After defeating the Находчивый Крыс, the reward room has eight pedestals with Сердцеs, Доспехи, Ключs, Пустышкаs, Стеклянный камень Гуона, and Боеприпасы
• Four special chests in the room require Крысиный ключs and contain Устранитель, Надкушенный сыр, Находчивый мешок, and Крысиные сапоги. Крысиный ключs only drop during the third Punch-Out phase of the fight, up to six per fight
• The reward room also has a secret room with a snake hidden behind two locked doors — items can be dropped through the second door, so only one Крысиный ключ is needed to feed it
• Feed the snake 4 guns or items and it follows you as a companion until the Ружезмей fight, where it defects and is absorbed to trigger the Advanced Dragun. That is the route to Дырявый Грааль and the "Advanced Slayer" achievement (the other is throwing a Странное яйцо into fire)
• The snake refuses Сгоревший телевизор, Губка, and Надежные отмычки — do not count on those to make up the four
• Alternatively, you can kick the Находчивый Крыс into the snake to feed it
• After the reward room you can proceed to the Hollow normally, or spend a Крысиный ключ to skip directly to the Кузня
• First visit unlocks Странное яйцо

R&G Dept.

Located between Hollow and Кузня. No connection to the other secret floors.

Cost: 1 Патрон Мастера + 2 guns or items (sold to the Скупщик in Hollow)

Steps to enter

1. Find the Скупщик in Hollow
2. Sell the Патрон Мастера and 2 items — the entrance opens immediately after the third item is sold, so sell the Патрон Мастера last if you want to keep trading first

Notes

• The cost is steep: a Патрон Мастера proves you cleared a boss without damage, and you lose two usable items on top of that
• R&G Dept. has no shop and sparse pickups
• The map outline is deliberately shaped like a handgun; after beating Аганим there is no exit elevator — you have to throw yourself off the rooftop arena to reach the Кузня
• Only enter when your loadout has clear surplus — if your core weapon or survivability items are borderline, selling them for a bonus floor rarely pays off