Keep the Door Locked Rules Explained

There is no complete public rulebook

The most important rule in Keep the Door Locked is not a single sentence you can memorize. It is a way of thinking: observe before acting. You are alone in a hotel room after midnight, strangers knock, cameras show the hall, and the room can develop anomalies. The game expects you to notice context, not simply obey every request or trigger every interaction.

That matters for accuracy too. The official description and badge names confirm several encounters and outcomes, but they do not publish every condition, timer, sanity value, or spawn rate. A good guide should separate what is confirmed from what is a safe inference. The Losing It badge confirms that sanity can reach zero. Door Held confirms survival against a door breaker. Not Today confirms that a shadow figure can be banished. Those are facts. Claims such as an exact percentage chance or a guaranteed schedule are not verified and should not be treated as rules.

Rule one: inspect before committing

A knock produces urgency, but urgency is part of the test. Check the camera before opening the door whenever the situation allows it. Notice who is there, how they are standing, what they say, and whether the picture fits their claim. A visitor who asks to be let in does not become safe because they sound confident.

Then choose the smallest response that preserves your options. If you lack evidence, waiting or refusing can be safer than opening. If an event has a clear prompt, follow the prompt once rather than repeatedly clicking through it. This is the foundation of Camera and Door Decisions and should be your default even after you learn individual encounters.

Rule two: anomalies may have stages

Badge evidence strongly suggests that at least some room anomalies progress through stages. Three Strikes says to check the window at stage 3, and Flush of Fear says to push the toilet anomaly to its second-to-last stage. The practical lesson is not “always wait until stage 3” or “always advance the toilet.” It is that the same object can mean different things at different stages.

When the window changes, observe what is different and remember the order of changes. Check it deliberately instead of rapidly interacting until something happens. When the toilet behaves oddly, decide whether you are on a safe survival run or a controlled discovery run. If you are protecting a ten-day attempt, avoid escalating an uncertain event. If you are researching it, change one variable at a time and accept that a failed experiment may cost the run.

The room hider tied to Caught You Looking supports the same idea: looking is itself a meaningful action. Do not assume that every hidden presence should be confronted immediately. Watch carefully, note the position, and consult Dream Room if the entire room feels detached from the normal night loop.

Rule three: protect sanity

Sanity is a condition to manage, even though the full mechanics are not documented. The zero-sanity badge is enough reason to treat escalating horror, careless door choices, and prolonged experimentation as possible risks. A sensible policy is to spend short, purposeful time with an anomaly and then return to a normal room check. Do not stack multiple unknowns: for example, do not push a bathroom event while ignoring a knock and a suspicious camera image.

If the room begins to feel unreliable, simplify your play. Check your immediate surroundings, respond to the active threat, and postpone optional secrets. This conservative approach is explored in Sanity Guide. It does not promise a magic recovery action; it helps you avoid making a bad state worse.

Rule four: special threats have special responses

Not every danger is solved by keeping the door closed. The door breaker is associated with the Door Held badge, so a survival sequence may require sustained attention to the door rather than passive waiting. Read Survive the Door Breaker before testing that encounter. The shadow figure is associated with Not Today, meaning it can be banished; Banish the Shadow Figure focuses on recognizing the event and prioritizing its response.

A key rule here is to follow the current threat, not your last plan. If you were searching for the golden skeleton and the door breaker appears, survival takes priority. Ending paths are repeatable only if you remain alive long enough to reach their decision points.

Rule five: badge clues are leads, not walkthroughs

Badges reveal many real goals: surviving 10 days, finding a golden skeleton, accepting a strange grandma’s key, helping someone for Kindness, hitting the pizza rat with a baseball bat for Rat Buster, and earning more than 1,000,000 for Blood Money. Use these names to decide what to test. Do not stretch them into unsupported claims such as “the rat appears every fifth day” or “money opens the skeleton ending.”

For endings, keep separate notes on the exact choice you made and what happened immediately before it. Golden Skeleton Ending and Grandma Key Ending explain this controlled-testing method. It is more useful than blindly copying a rumor because it tells you whether a prerequisite is still uncertain.

The safest rule summary

Check first. Act once. Watch for escalation. Protect sanity. Prioritize an active threat over an optional secret. Test one unusual condition per run. That is the closest thing to a universally reliable rule set currently supported by the game information. Begin with How to Play if you need the full night-loop context, then use the encounter pages when a badge-supported threat becomes your next goal.