Monsters in the Mansion: How the Monster Detects You

Everything the Monster knows about you comes through two senses — and they work in a strict order: sound first, sight second. Understanding that order is the single most valuable piece of knowledge in Monsters in the Mansion, because every survival habit, every route plan and every cure window is built around feeding the Monster as little information as possible.

Sense 1: Hearing — the Monster's primary sense

The Monster's ears are its main weapon, and Survivors trigger them constantly without realizing:

• Sprinting — the loudest normal action in the game
• Open-mic voice chat — your real voice is in-game audio; idle chatter is a flashlight for your position
• Thrown items — deliberate noise, useful only as planned decoy work
• Loud perk effects — any noisy interaction near a patrol route pulls the hunt

Patrol state: while the Monster has heard nothing, it walks a fixed patrol pattern. That pattern is learnable — survivors watch it for two cycles, predict the third, and route books through the gaps. Good Monsters vary the loop; good squads read it anyway.

The voice rule: use push-to-talk and short positional callouts only. Full lobbies have died to one open microphone. The complete noise discipline is in How to Survive.

Sense 2: Vision — the confirming sense

Sight is the Monster's second sense and the one that starts chases:

• Flashlights reveal you at distance. A beam in a dark hallway is visible from far away — keep your flashlight off in hunting zones.
• Lit rooms and open doorways expose you. Standing in or crossing bright space while the Monster looks your way is a lock-on.
• In darkness, the Monster struggles to track you. The dark is not a hazard in this game — it is your equipment.

The classic giveaways, in the community's words: a flashlight on in a patrol room, standing in a lit doorway, moving across an open gallery. All three are voluntary.

The detection sequence, end to end

1. The Monster patrols its fixed pattern.
2. A sound pulls it toward the source — it investigates.
3. Sight confirms and locks; the chase begins.
4. Survivors break line-of-sight (corner-peels, furniture, bookshelves) to reset.
5. If the Monster loses both sound and sight, it returns to patrol.

Two consequences follow from the sequence. First, crouch-walking is much quieter than sprinting but not silent — it is your default movement, not an invisibility cloak. Second, you can only break detection after breaking sight: hiding while the Monster still sees you fails, and movement inside a hiding spot makes noise anyway. The ranked hide list is in Best Hiding Spots.

How each role plays against detection

Role	Detection problem	Answer
Runner	Constant wing sweeps near patrols	Crouch routes over carpet, ping books instead of calling them
Decoy	Wants to be heard — on their schedule	Vary bait patterns; bait along defensible exits
Cure carrier	Point-blank approach to the loudest player	Approach on the decoy's timing, from the quiet wing
Support	Station guards stand still in predictable spots	Break the pattern — never guard from the same corner twice
Monster	Reading which noise is bait	Hunt the silence, not just the sound

The role definitions live in the characters guide, and the Monster's side of this table in How to Play the Monster.

No numbers — on purpose

Hearing radius, sight range, lock-on timers and decay rates have not been published in Early Access, and this page deliberately contains no made-up values. The behavioral model above has been stable across the Early Access build; if a balance patch changes it, the update lands in the patch notes tracker and here. For the practice built on these rules, finish with the cure loop in How to Cure the Monster — detection knowledge only pays off once it protects the antidote.