Backrooms Bounded

Backrooms Bounded is a psychological horror mod for Fabric 1.21.1, heavily inspired by the Backrooms by Kane Pixels (Kane Parsons).

Unlike traditional dimension mods, Backrooms Bounded focuses on tension, paranoia, and survival.

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Trailer

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Features

Endless Procedural Backrooms

Every hallway, room, and corridor is procedurally generated, creating an infinite maze:

• Endless interconnected hallways
• Multiple floor levels
• Decaying and infected wallpaper
• Flickering lights
• Empty lockers and forgotten objects
• Bacterial growths spreading throughout the complex
• Massive office rings spanning thousands of blocks
• Randomly generated loot in barrels (works with other mods too)

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Panic System

Spending time in darkness and isolation slowly raises your panic level. As panic increases, so do the psychological effects, making survival increasingly difficult.

• Heartbeat sounds at high panic
• Visual disturbances
• Random panic effects at extreme levels
• Panic affects how entities detect you

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Survival Horror

• Armor becomes less reliable over time
• Resources must be scavenged from the environment
• Stealth is often more valuable than speed
• Sound matters
• Every decision can attract unwanted entities
• Hiding in lockers may work for some time
• Sneaking on wool/carpet/moss makes you harder to detect

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Organic Infection

Bacterial growths spread across walls, floors, and ceilings. These organisms slowly corrupt nearby blocks and seem connected to whatever lurks within the Backrooms.

• Bacteria shrooms that detect noise
• Bacteria vines that spread across surfaces
• 3 strikes from shrooms alerts the bacterium

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Soundscape

Backrooms Bounded includes a collection of ambient sounds and environmental audio.

Expect:

• Distant ambient noises
• Unsettling atmosphere
• Dynamic panic effects
• Entity audio cues

Headphones are highly recommended.

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Entering the Backrooms

The methods of entering and escaping the Backrooms are intentionally left undisclosed to preserve discovery.

(Hint: Every entry and exit chance is configurable)

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Entities

The Bacterium

A mysterious entity roams the Backrooms.

The longer you survive, the more dangerous it becomes.

⚠ Spoiler: Bacterium Behavior

• Uses multiple methods to track players
• Reacts to sound and environmental disturbances
• Can stalk, observe, and ambush its targets
• Adapts to player behavior
• Learns new interactions over time
• Becomes increasingly effective against common hiding strategies
• Can be distracted by thrown projectiles
• Checks lockers
• Struggles to hear players sneaking on wool/carpet/moss

The Mimic

Not every figure wandering the Backrooms is what it appears to be.

Trust becomes a dangerous thing.

⚠ Spoiler: Mimic Information

The Mimic can disguise itself as a player. Depending on your behavior, it may act as a companion, observe from a distance, or become hostile.

• Responds to player commands (sometimes)
• Can follow, stay, pick up items, open containers (sometimes)
• Becomes aggressive if provoked

Corpses

Four types of corrupted corpses roam different dimensions. Each has unique behaviors, detection methods, and interactions. Some remain dormant until disturbed. Others are always active.

⚠ Spoiler: Corpse Information

Villager Corpse:

• Spawns in backrooms (outside of office rings)
• 3-hit system to destroy dormant corpse
• Relies on sound and smell
• Screams to alert the bacterium
• Can follow through 1-block spaces
• Opens doors, gates, and trapdoors
• Leather armor increases smell range
• Wool/carpet/moss reduces hearing

Player Corpse:

• Spawns when a player dies in the backrooms
• Stores the player's entire inventory as a grave
• Never despawns
• 3-hit system to retrieve loot
• Relies on hearing (better than villager corpse, but has shorter smelling range)
• Breaks wooden doors, climbs ladders
• Can crawl through 1-block spaces

Enderman Corpse:

• Spawns in overworld, nether, and end
• Always active
• Aggro when hit or shot (no eye-based aggro)
• Small chance to aggro when player kills villager corpse nearby
• Water/rain immune
• Cannot pick up blocks
• Calm with Ender Pearl or Eye of Ender
• Enraged by Spider Eye
• Occasional custom sounds

Creeper Corpse:

• Spawns rarely in overworld and backrooms
• Always active
• Triple explosion power
• Can be charged by lightning
• Spreads bacteria vines across crater
• Blindness effect for 5 seconds to nearby players

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Printer

Rarely found in office cubicles, these blocks can transform items.

⚠ Spoiler: Printer Mechanics

• Accepts any item from your hand
• Returns a random crafting result using that item
• 30% chance to return the same item
• 5% chance to jam (permanently consumes the item)
• 5 uses per player, then 40-minute cooldown
• Works with items from other mods
• Glows when processing

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Configuration

Backrooms Bounded is fully configurable through both the config file and in-game commands.

In-Game Commands

Works for all players, no cheats required:

/backroomsconfig show
/backroomsconfig set <setting> <value>
/backroomsconfig reset

Config File

Located at config/backroomsbounded.json

Configurable Options Include:

• Bacterium speeds, damage, spawn rates
• All entry/exit method chances
• Corpse
• Glitch block chances

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Planned Features

Future updates are planned to expand the experience with:

• New entities
• New unique blocks
• Additional Backrooms areas
• Cameras and photography systems
• Expanded environmental storytelling
• New survival mechanics
• More procedural structures