The Room: Old Sins Walkthrough — Complete Puzzle Guide for Every Area

Game Overview & Dollhouse Structure

The Room: Old Sins drops you into the Waldegrave Manor attic, where an engineer and his wife have vanished during occult experiments. Your only lead is an elaborate dollhouse sitting on a table. Each of its five rooms, Foyer, Study, Kitchen, Curiosity Room, and Attic. Contains a self-contained puzzle sequence that feeds into the larger mystery of the Null element.

The dollhouse mechanic is what separates Old Sins from earlier Room games. You pinch to zoom into miniature rooms that expand to full scale, solve puzzles inside them, then zoom back out to see how your progress changed the dollhouse exterior. Some items found in one room unlock mechanisms in another, so you'll move between areas more than you'd expect.

Fireproof rates the game at about 4 hours of playtime. That tracks if you don't get stuck anywhere, but the Kitchen and Curiosity Room alone can burn 90 minutes if you miss certain interactions. The game is rated 4.8 stars across both app stores with over 100,000 reviews, and it earned that reputation. The puzzle design is mostly excellent, with a few frustrating exceptions I'll flag below.

Area	Difficulty	Time Est.	Key Mechanics	Stuck Point
Foyer	Easy	20-30 min	Clockwork gears, basic eyepiece	Missing the clock face rotation
Study	Medium	30-45 min	Cipher wheels, hidden compartments	Cipher disc alignment
Kitchen	Hard	40-60 min	Alchemy mixing, chemical reactions	Correct liquid combination order
Curiosity Room	Hard	40-60 min	Optical illusions, Null element	Finding the hidden eyepiece trigger
Attic	Medium-Hard	30-45 min	All mechanics combined, final sequence	Multi-room item transfer

Core Mechanics You Need to Understand

The Eyepiece

The eyepiece is a special lens you acquire early in the Foyer. When equipped, it reveals hidden markings, ghostly fingerprints, and Null-infused objects that are invisible to the naked eye. The game teaches you to use it once, then expects you to remember it exists for the rest of the playthrough. Here's what they don't tell you clearly: the eyepiece doesn't just reveal markings on surfaces. It also reveals entirely new interactive elements. Buttons, levers, and panels that don't exist without the lens active. If you're stuck, toggling the eyepiece on every surface in the room is almost always the right first step.

Inventory Management

Your inventory holds every item you collect. Unlike some escape room games that auto-use items when you approach the right spot, Old Sins requires you to manually select an inventory item and then tap the object you want to use it on. Items disappear from inventory once correctly applied. If tapping does nothing, either you have the wrong item selected or you haven't triggered a prerequisite step. One quirk: some items can be examined and manipulated within the inventory itself. Rotate items, open flaps, pull levers, anything that looks interactive probably is.

Zooming Between Scales

Pinch outward to zoom into a room. Pinch inward to zoom back to the dollhouse view. Some puzzles require you to notice something at the dollhouse scale that's invisible when zoomed in. A pattern on the exterior wall, a shadow cast by another room's light, or a mechanism that spans two rooms. When you're stuck inside a room, zoom all the way out and look at the dollhouse from different angles.

Area 1: The Foyer

The Foyer functions as Old Sins' tutorial. You'll learn the basic touch controls (swipe to rotate objects, tap to interact, pinch to zoom), acquire the eyepiece, and solve your first set of clockwork puzzles. The room is styled like a Victorian entrance hall with a grandfather clock, a writing desk, and a locked cabinet.

Step-by-Step Walkthrough

1. Examine the table in the center. Rotate the dollhouse to find the Foyer's entrance. Pinch to zoom in. The first thing you see is a sealed envelope on a side table, open it to get a letter and a small brass key.
2. Use the brass key on the writing desk drawer. Inside you'll find a clockwork gear and a note about the eyepiece. The note hints that "not everything is as it appears". This is the game teaching you that hidden elements exist.
3. Examine the grandfather clock. The clock face is missing a gear. Insert the clockwork gear from your inventory. The clock face becomes interactive, rotate the hands to match the time shown in the letter (the exact time varies, but look for Roman numerals in the correspondence). A compartment opens below the clock face.
4. Retrieve the eyepiece lens. The compartment contains the eyepiece. Once collected, a new icon appears in the bottom-right corner of your screen. Tap it to toggle the lens on and off.
5. Use the eyepiece on the locked cabinet. With the lens active, you'll see glowing fingerprints on the cabinet door. Follow the fingerprint trail. It leads to a hidden button on the side panel. Press it. The cabinet opens, revealing a mechanical puzzle box that serves as the Foyer's final challenge.
6. Solve the puzzle box. This is a sliding tile mechanism with four panels. Each panel has a symbol that needs to align with matching symbols on the frame. Slide them into position (the order doesn't matter, only the final alignment). Completing this opens a passage deeper into the dollhouse and unlocks the Study.

Common stuck point: Players miss that the clock hands are rotatable. The interaction zone is small. You need to tap and hold directly on a clock hand, then drag. If you're tapping the clock face itself, nothing happens.

Area 2: The Study

The Study introduces cipher-based puzzles and hidden compartments. The room is darker than the Foyer, filled with bookshelves, a large desk with locked drawers, and a globe that conceals a mechanical device. The difficulty jumps noticeably here. You'll need to combine items, decode symbols, and use the eyepiece more aggressively.

Step-by-Step Walkthrough

1. Examine the desk. The center drawer is locked with a three-symbol combination. You don't have the code yet, move on. The side drawer slides open freely and contains a magnifying handle (not the eyepiece, a separate tool that attaches to a device later).
2. Inspect the bookshelves. One book on the second shelf has a slightly different spine color. Pull it out to reveal a hidden alcove containing a cipher disc. A rotating wheel with two rings of symbols. This is your decryption tool for the rest of the Study.
3. Use the eyepiece on the wall behind the desk. Hidden symbols appear — three of them, arranged vertically. These are your combination for the desk's center drawer. Match each symbol to its corresponding position on the cipher disc to decode the combination. The outer ring symbol maps to the inner ring letter. Enter the decoded symbols on the desk lock.
4. Open the center drawer. Inside is a ornate metal key and a folded blueprint. The blueprint shows a cross-section of the globe on the table. There's a mechanism inside it.
5. Open the globe. Use the metal key on the small keyhole at the globe's equator. The globe splits open to reveal a mechanical orrery (a miniature solar system model). The orrery has three rotating arms with planet-like spheres.
6. Align the orrery. The blueprint from the drawer shows the correct positions of all three arms. Rotate each arm to match the blueprint's positions. When all three align, a hidden panel at the globe's base opens, containing a Null artifact fragment.
7. Use the eyepiece on the Null fragment. It reveals a spectral scene, a ghostly figure at the desk, writing. The figure points to a specific bookshelf panel. Interact with that panel to find the Study's exit mechanism.

Common stuck point: The cipher disc alignment trips people up because the game doesn't explain that you need to match the OUTER ring to the INNER ring, not the other way around. If your decoded combination doesn't work, try reading the disc in the opposite direction.

Area 3: The Kitchen

The Kitchen is where Old Sins gets genuinely difficult. The room introduces chemistry and alchemy puzzles. You'll mix liquids, heat substances, and trigger chemical reactions in a specific sequence. The puzzle logic is internally consistent but poorly communicated. Expect to spend the most time here.

Step-by-Step Walkthrough

1. Survey the room. The Kitchen has a large stove with burners, a sink with running water, a locked pantry, and a workbench with glass vessels. Start with the workbench. There's an open journal with alchemical notes showing three liquid combinations and their results.
2. Collect ingredients. Open the unlocked cabinets around the room. You'll find three colored vials (amber, blue, clear) and a metal crucible. The pantry is locked. You'll return to it later.
3. Mix the first combination. The journal shows amber + clear = a green reactive solution. Pour amber into a glass vessel on the workbench, then add clear. The liquid turns green and begins to glow faintly. This green solution is a solvent.
4. Apply the solvent. Use the green solution on the rusted lock mechanism on the pantry door. The rust dissolves, but the lock still needs a key. However, the cleaned mechanism reveals a pattern, a sequence of four symbols you need for later.
5. Mix the second combination. Blue + clear in the crucible, then heat it on the stove's left burner. The liquid evaporates and leaves behind a crystalline residue. Collect the residue. It's a key-shaped crystal.
6. Open the pantry. The crystal key fits the pantry lock. Inside is a larger apparatus, a distillation setup with connected tubes and a collection flask. There's also a fourth vial (red) on the top shelf.
7. Run the distillation. Place the red vial in the distillation apparatus input. Light the burner beneath it (use the stove matches from the drawer near the stove). The distillation produces a dark purple extract in the collection flask.
8. Use the eyepiece on the purple extract. The Null element reacts. The purple liquid reveals a spectral map etched into the workbench surface. This map shows the location of a hidden floor panel. Interact with the floor panel to access the Kitchen's exit.

Common stuck point: The liquid combination order matters. If you add clear before amber (instead of amber before clear), nothing happens and the game gives zero feedback about why. This is the most complained-about puzzle in the game, players try every combination expecting error messages, but Old Sins just silently rejects wrong orders. If a mixture doesn't react, try reversing the order.

Area 4: The Curiosity Room

The Curiosity Room is the most visually striking area. A cabinet of wonders filled with optical instruments, mirrors, prisms, and a central device that manipulates light. The Null element is strongest here, and the eyepiece reveals an entirely different version of the room overlaid on the physical one. The puzzles are clever but occasionally unfair. Two of them require noticing subtle visual details that blend into the dark environment.

Step-by-Step Walkthrough

1. Examine the central device. It's a large optical instrument with multiple lenses, dials, and a viewing port. You can't use it yet. Three lenses are missing from their mounts.
2. Find Lens 1 (mirror cabinet). The ornate mirror on the left wall isn't just decorative. Tap the frame's corners in sequence (top-left, bottom-right, top-right, bottom-left, the order is shown by tiny arrows etched into the frame, visible only with the eyepiece). The mirror swings open to reveal the first lens.
3. Find Lens 2 (prism puzzle). A triangular prism sits on a stand near the window. Rotate it until light passes through at the correct angle. You'll know it's right when a rainbow spectrum projects onto the opposite wall. The spectrum illuminates a hidden shelf. The second lens is on that shelf.
4. Find Lens 3 (the hardest one). Use the eyepiece while standing near the central device. A ghostly image shows a figure hiding something beneath the floorboards. Look down — there's a barely visible seam in the floor near the device's base. Tap it to pry up a floorboard and retrieve the third lens.
5. Assemble the optical device. Insert all three lenses into their mounts on the central instrument. Each mount has a slightly different diameter. The lenses only fit in the correct order (smallest to largest, left to right).
6. Look through the viewing port. The assembled device shows a Null-infused vision of the Waldegrave Manor in its prime. The vision contains a numerical sequence displayed on a banner. Memorize or note this sequence.
7. Enter the sequence. On the back of the optical device is a numbered dial that was previously non-functional. Enter the sequence from the vision. A mechanical compartment opens at the device's base, containing the Curiosity Room's Null artifact and the passage to the Attic.

Common stuck point: Lens 3's floorboard seam is almost invisible in the room's dark lighting. Many players spend 20+ minutes searching cabinets and shelves for the third lens without thinking to look at the floor. If you're stuck with two lenses and can't find the third, equip the eyepiece and look directly down near the central device.

Area 5: The Attic

The Attic is the final area and the shortest, but it draws on every mechanic from the previous four rooms. You'll rotate gears (Foyer), decode ciphers (Study), mix a substance (Kitchen), and use optical alignment (Curiosity Room), all in service of the final confrontation with the Null element. The atmosphere shifts here from mysterious to unsettling.

Step-by-Step Walkthrough

1. Examine the Null containment device. The Attic's centerpiece is a large mechanical apparatus designed to contain the Null element. It has four empty slots. One for each Null artifact fragment you've collected from the previous rooms. If you've been following this guide, you have all four. Insert them.
2. Activate the containment sequence. With all four fragments inserted, the device powers up but doesn't fully activate. A cipher appears on the device's surface. Decode it using the same method from the Study (outer ring to inner ring). The decoded message gives you a gear configuration.
3. Set the gears. The device has a gear mechanism similar to the Foyer's clock. Arrange the gears according to the decoded configuration. When correct, the device hums and a chemical reservoir opens.
4. Mix the final substance. The reservoir needs a specific compound. If you have the purple extract from the Kitchen (or a derivative), apply it here. If you used it already, zoom back out to the dollhouse and return to the Kitchen. The distillation apparatus has regenerated one more dose.
5. Final optical alignment. The device projects a beam of light. Use the lens controls on the device to focus the beam onto the Null element (similar to the Curiosity Room's prism puzzle). The targeting reticle needs precise alignment, adjust both the horizontal and vertical dials until the beam converges.
6. Watch the ending. The containment sequence triggers the game's final cutscene. Without spoiling the narrative: the ending is deliberately ambiguous, and there's a reason the dollhouse exists in the first place. The game gives you enough to piece together what happened to the Waldegraves if you've been reading the letters and journal entries throughout.

Common stuck point: Step 4 confuses players who already used the Kitchen's purple extract. The game doesn't tell you that the distillation apparatus resets after you leave and re-enter the Kitchen. If the Attic's reservoir prompt seems impossible, zoom out, go back to the Kitchen, and run the distillation again.

General Tips & Common Mistakes

• Toggle the eyepiece constantly. The game's biggest design quirk is that crucial interactive elements are invisible without the eyepiece. Get into the habit of scanning every new surface with the lens active. If you're stuck for more than five minutes, the answer is almost certainly hidden behind the eyepiece.
• Rotate items in your inventory. About a third of inventory items have secondary interactions. Flip them over, open hinges, pull levers. If an item looks more detailed than a simple key or tool, it probably has a hidden function.
• Read every document. Letters, journals, and notes aren't just flavor text. They contain codes, sequences, and clues that you'll need for puzzles in other rooms. The game rarely signposts when a document is mechanically important versus atmospheric.
• Zoom out when stuck. Some puzzles span multiple scales. A pattern visible on the dollhouse exterior might be the solution to a lock inside a room. If you've been stuck inside a room for a while, zoom all the way out and examine the dollhouse from every angle.
• Don't force interactions. If tapping an object does nothing, you're either missing a prerequisite step or trying the wrong item. Old Sins never requires rapid tapping, swiping speed, or precise timing. Every interaction is deliberate and patient.
• The hint system exists. After being stuck for a few minutes, a lightbulb icon appears. The first hint is vague, the second is more specific, and the third tells you exactly what to do. Using hints doesn't penalize you. There are no scores or rankings. If you've genuinely hit a wall, the third hint is there to keep you moving.

For more puzzle-solving frameworks that apply across the genre, the escape room puzzle strategies guide covers pattern recognition and systematic search techniques that work in any Room game.

How Old Sins Compares to Other Room Games

Old Sins is the fourth entry in The Room series, and it's a different experience from its predecessors. The Room 1 was a single puzzle box on a table. The Room Two expanded to multiple rooms. The Room Three added a hub-world structure. Old Sins goes further with the dollhouse, but the trade-off is that individual puzzles feel slightly less intricate than The Room Three's. The dollhouse navigation is the star, the puzzles serve it rather than the other way around.

If you've finished Old Sins and want more, the Rooms & Exits walkthrough covers a game with deeper puzzle chains and more rooms to work through. The mechanical satisfaction is similar, though Rooms & Exits trades atmosphere for puzzle density.

A Note on Privacy While Gaming

Old Sins is a premium game with no ads and no analytics tracking beyond basic crash reporting. That said, if you play mobile games on public Wi-Fi. Coffee shops, airports, hotels, your broader browsing traffic is exposed. A VPN encrypts that traffic so it's unreadable to anyone on the same network. NordVPN works reliably on both iOS and Android without noticeable latency for non-multiplayer games like Old Sins. It won't affect your puzzle-solving experience, but it protects everything else happening on your phone.

Frequently Asked Questions

How long does The Room: Old Sins take to complete?

Most players finish in 3 to 5 hours on a first playthrough. The Foyer takes about 20-30 minutes, the Study and Attic each around 30-45 minutes, and the Kitchen and Curiosity Room can take up to an hour each if you don't use hints. Players already familiar with The Room series tend to finish closer to 3 hours.

Do I need to play the previous Room games first?

No. Old Sins has its own self-contained story about the Waldegrave family. The Null element connects all four games thematically, but you won't miss any puzzle solutions or narrative context by starting here. That said, players who've completed The Room Three will recognize certain visual motifs and find the eyepiece mechanic immediately intuitive.

What's the hardest puzzle in Old Sins?

The Kitchen's liquid combination puzzle frustrates the most players, largely because the game gives no feedback when you mix liquids in the wrong order. It just silently fails. The Curiosity Room's third lens is also widely cited as a sticking point because the floorboard seam is nearly invisible. Both are solvable with patience, but neither is well-communicated by the game's design.

Is The Room: Old Sins available on PC or console?

Yes. Old Sins launched on iOS and Android for $4.99, but it's also available on Steam (PC) and Nintendo Switch. The PC version supports mouse controls, and the Switch version uses touchscreen in handheld mode or pointer controls in docked mode. The mobile version remains the best-reviewed due to the natural touch interactions. Rotating objects and pinching to zoom feel more intuitive on a phone or tablet.

Can I replay individual rooms after finishing the game?

Old Sins doesn't have a chapter select. Once you complete the game, you'd need to start a new save to replay specific areas. Some players keep a second save file where they stop at the Kitchen or Curiosity Room. The two areas with the most mechanical depth. The lack of chapter select is a missed feature, especially for a game where individual rooms are strong enough to replay independently.