MOUSE: P.I. For Hire – The House Of The Empty Mouse Walkthrough

The nastiest moment in MOUSE: P.I. For Hire – The House Of The Empty Mouse is when the mansion finally seems to open up, then immediately punishes that confidence with a floor collapse and a wave of new enemies. That is the real trick of this mission. Bandel’s Mansion is not a straight push from one locked door to the next. It is a layered exploration level built around revisiting rooms after the house changes.

If you want the clean route, do this: clear the mansion carefully instead of sprinting ahead, take the early basement vent detour if you are doing a secrets run, use the library and spiral staircase as your anchor points, activate the mansion’s switch or lever when you reach it, then immediately start rechecking old rooms because the collapse opens the real path. From there, use the newly accessible vents, crawlspaces, and underground sections to work your way toward the front balcony and the Perch With a View tower.

That is the broad path every reliable walkthrough agrees on, even though collectible labels can differ. Some guides emphasize comics, cards, and schematics. Others call out statues, safes, vault loot, or achievement-related pickups. The safe advice is to trust the route landmarks more than the exact item names.

The route that actually gets you through Bandel’s Mansion

The mission revolves around four spaces that keep reconnecting: the main mansion rooms, the library area, the basement or underground passages, and the balcony route leading to Perch With a View. If you stop thinking of them as separate zones and start treating them like a loop, the whole stage becomes much easier to read.

Step 1: Enter the mansion and clear rooms before chasing the next doorway

The early mistake here is playing too aggressively and assuming every open door is forward progress. It usually is not. Enemy groups in this mission are tied to exploration gates, which means half-clearing a room and running past corners can make you miss both secrets and the clue to the next route. When you enter a major room, finish the fight first, then do a fast sweep of the walls, bookcases, side doors, and any obvious interactable object.

Keep an eye out for the upper-floor path and the spiral staircase. Those are not just side architecture. They connect directly to one of the earliest useful detours in the level and also help you orient yourself after the mansion starts changing shape.

Step 2: Take the early basement vent detour if you want easy resources

One of the best hidden routes in The House Of The Empty Mouse comes from the upper section of the mansion. From there, head down the spiral staircase into the basement and look for a vent route. That vent leads to a warp pipe and then to a secret area with a safe, money, and ammunition. It is not required for level completion, but it is exactly the kind of side path that makes later fights less messy.

This detour is worth doing early for two reasons. First, it pays you back with resources before the mansion’s bigger combat pivots. Second, it teaches you the level’s logic: if something looks decorative, especially a vent, fireplace, or odd wall section, it may become usable now or after a later trigger. There is also a quick-return drop through the floor from this secret area, so the detour should not ruin your pace.

Step 3: Use the library as your anchor and handle the statue objective as you find it

The library is one of the safest mental checkpoints in the entire mission. If you are unsure where the run wants you to go next, ask whether the game has given you a new way back into the library, a new item to bring there, or a new exit out of it. Several public guides also point to a side objective involving three statues that need to be returned to the library pedestals.

If you are doing a completionist run, do not leave those statues for later unless you are absolutely sure of the route back. Carry each one to its pedestal as soon as you can do so safely. This is one of those classic mansion-game tasks that sounds simple and becomes annoying only when you try to remember which rooms you already looted after the floor plan changes.

Different walkthroughs disagree a bit on how they describe the level’s collectibles, but they agree that The House Of The Empty Mouse is dense with secrets. So if you are playing for statues, safes, or other hidden pickups, the library is not just a lore room. It is part of the mission’s navigation spine.

Step 4: Treat the switch or lever as the level’s big reset, not a simple unlock

When you reach the mansion switch, do not assume you are about to open one clean path forward. This trigger is the mission’s major structural pivot. Multiple walkthroughs describe the same outcome: after activation, the floor collapses around the typewriter room or a nearby area, your clean route breaks, enemies appear again, and older parts of the mansion suddenly matter much more than they did five minutes earlier.

The best response is not to panic and run deeper. Backtrack with purpose. Revisit the rooms that looked suspicious earlier, especially any place with vents, fireplaces, fragile walls, and dead-end corners. This is the point where the mansion starts rewarding players who were paying attention to the environment instead of only the objective marker logic.

If you get knocked off your route by the collapse, return to a landmark you recognize first, usually the library or the staircase loop, then branch out. The level is built to feel chaotic here, but its underlying structure is still readable once you reconnect yourself to one of those repeat spaces.

Step 5: Recheck fireplaces, vents, and broken walls after the collapse

This is where most missed secrets happen. After the switch event, environmental changes are not just visual flair. They are progression tools. One of the clearest examples is a fireplace route: after certain enemy clears and trigger events, a previously active fireplace can go out, letting you crawl through it to reach a hidden collectible area. If you noticed a fireplace earlier and thought, “That looks like a secret later,” this is the stage where that instinct usually pays off.

The same goes for vents and structural damage. At least one route through the mission involves new basement access after walls break and another floor gives way. That means a room that seemed finished before the collapse may now hide the actual path forward. When the game changes the house, it is teaching you to replay the map with fresh rules.

Step 6: Push through the underground route and exit onto the balcony

Once you have exploited the newly opened secret routes, the mission starts steering you out of the mansion’s interior maze and toward the exterior-facing sections. The broad goal here is consistent across walkthroughs: fight through the basement or underground progression route, regain the front-side approach, and reach the balcony that leads into Perch With a View.

Do not treat the balcony as a victory lap. It is the payoff for reading the house correctly, and it is easy to sprint there and leave collectibles behind. Before you fully commit to the tower approach, do one last sweep of the nearest rooms and transition spaces. This mission likes to hide value just off the obvious exit line.

What to check if you are going for secrets and collectibles

Exact collectible totals are the shakiest part of public information on this level, so a room-by-room sweep works better than counting categories. If your run is about 100% completion, these are the most reliable landmarks to revisit:

• The early basement vent and warp-pipe room with the safe, money, and ammo.
• The library, especially if you are handling the three statues and pedestal placements.
• Any fireplace that looked decorative on the first pass but becomes usable later.
• Collapsed-floor routes, broken-wall openings, and underground passages unlocked after the switch.
• The final balcony approach to Perch With a View, where it is easy to miss side loot while focusing on exit momentum.

If you are specifically chasing the Portable Freezer or another named secret, use those landmarks instead of relying on one guide’s collectible terminology. Community summaries are stronger on route logic than they are on item-by-item naming, so the safest completion strategy is to search every side area tied to vents, fireplaces, safes, and post-collapse basement access.

Common ways this walkthrough goes wrong

• Rushing the switch or lever and assuming the next path is ahead instead of behind you.
• Ignoring the spiral staircase and basement vent because it looks optional. It is optional, but it teaches the whole level’s secret-path language.
• Leaving statue returns for “later” and creating extra backtracking through a reshaped mansion.
• Not revisiting old rooms after the collapse. In this mission, backtracking is progression.
• Trusting exact collectible counts more than physical landmarks. The room logic is more dependable than the labels.

Route flow appears to be the same for PC and console players, so this walkthrough should hold up regardless of platform. The mission’s challenge is spatial awareness, not platform-specific execution.