How to Find Secret Rooms

Secret rooms are rooms that don't appear on the map by default. Most floors have one, though it's possible to have none or several. Their entrances are hidden in walls and require specific methods to open.

What secret rooms can contain

• Pickups: ハート, キー, アーマー, ブランク, 弾薬
• ガラスガンストーン, chests (see Chest Guide (Qualities & Mimics)), shrines, and a Mirror
• NPCs: the 銃交換の魔女たち, the 老人 and 真理の探求者 – ブラザー・アルバーン appear only in secret rooms; other NPCs can show up here too (see All NPCs & Merchants Guide for what each one does)
• ハイドラガンファイア (secret rooms only), Evil Muncher (weapon-swap mechanics: see Dungeon Objects Guide (Mirrors, Black Market & Munchers))

Locating secret rooms

There are three ways to locate a secret room: read it straight off an item, test the wall itself, or narrow the search down from visual cues in the layout.

Locating it with items

These items reveal secret room locations directly, no guesswork needed:

• マップ / ガンジョン ブループリント — Shows all rooms on the floor including secret rooms
• 分厚い札束 — A small indicator appears next to secret room entrances
• シナジー - 啓もう — A synergy icon appears next to secret room entrances

Testing the wall

Without those items, shoot suspect walls with a non-infinite-ammo weapon — entrance walls develop visible cracks. Lower-damage guns need more shots before cracks appear; enemy bullets also work. To save ammo entirely, walk straight into a wall: if the character plays the walking animation without moving, there's an entrance there.

Narrowing it down visually

Visual cues also help: entrance walls are slightly different in color from surrounding walls (most noticeable in chest rooms); a corridor-width indent in a wall is a strong hint; and a short dead-end passage terminating at a wall (especially in shrine rooms) often hides an entrance. Entrances never appear behind room objects, and walls with no space behind them can be skipped.

Opening the entrance

Once found, use one of the following to open the wall:

• Use a ブランク
• Trigger a blank effect: エルダーブランク, ダルマ, テーブル殺法：空, 穴だらけの聖杯, ブランクリング, ブランク弾, armor breaking, コンポジットガン
• Certain explosives: ボム, リトルボンバー, or a fused chest exploding

Efficient search strategy

Checking every wall wastes ammo and time. Prioritize in this order:

• On the way through chest rooms, quickly shoot the wall on the side with no exit — chest rooms are small and quick to check
• In any non-店主 – ベロ NPC room, check the walls — secret rooms connect most often to shops, chest rooms, NPC rooms, dead-end corridors, and elevator exits
• After killing the Boss, spend leftover ブランクs in likely rooms — ブランクs refill to the default (usually 2) on the next floor anyway
• The starting room, boss room, the room just before the boss, the room containing the 古びた紋章, and the room leading to the 正銃教団修道院 never have secret rooms — skip them