The complete Momento Doctor's Loft puzzle solutions require you to unlock the Chronos Safe by finding three Celestial Lenses, solving the Astrolabe Projector puzzle, and using the resulting musical code on the Automaton Pianist. This guide provides the exact steps for every puzzle in Dr. Aris Thorne's apartment, including the locations of all three hidden Anamnesis Masks required for the True Ending.
This multi-stage puzzle is one of the most intricate in the game, but its logic is straightforward once you know the sequence. The main goal is to retrieve the "Lachryma Vial" from the large, clock-faced safe in the study. A secondary, missable objective is to find three masks, which unlocks a crucial piece of lore tied to the game's final outcome.
The Main Objective: Unlocking the Chronos Safe
This is the central puzzle of the loft. It's a four-step process that involves collecting items, solving a light-based puzzle, translating the result into music, and finally deciphering a code. Don't interact with the safe first; you won't have the information you need. Start by searching the loft for the key components.
Step 1: Find the Three Celestial Lenses
Three etched glass lenses are hidden around the main loft area. You need all of them to operate the Astrolabe Projector in the center of the room. Their locations are fixed.
- Sun Lens: In the small library alcove, inspect the bookshelf second from the right. A copy of 'A History of Mnemosyne' is a false book. Pull it to reveal a hidden compartment containing the Sun Lens.
- Moon Lens: On Dr. Thorne's main desk, you'll find a locked rosewood box. The small, ornate silver key isn't far. Check the base of the marble bust of Hippocrates on the mantelpiece; the key is tucked underneath. Use it on the box to get the Moon Lens.
- Star Lens: Look for the large celestial globe near the bay window. Interact with it and rotate the globe until the constellation 'Cassiopeia' is facing you (it's the only one with a faint shimmer). A small click will sound, and a panel will open on the globe's equator, revealing the Star Lens.
Momento in-game screenshot
Step 2: Solve the Astrolabe Projector
With all three lenses, return to the brass astrolabe in the center of the room. This device projects light onto the far wall, which is covered in a faint star chart. Your goal is to align the lenses to highlight three specific constellations, revealing a sequence.
- Place the Lenses: Insert the Sun, Moon, and Star lenses into the three empty slots on the astrolabe. The order doesn't matter.
- Activate the Projector: Hit the switch on the astrolabe's base. The room will dim, and three beams of light will hit the wall.
- Align the Beams: You can now rotate the rings on the astrolabe. Your clue is Dr. Thorne's journal, open on a nearby lectern. A page is bookmarked with the phrase, "The Serpent watches the Hunter, who follows the Lyre." This is the alignment order.
- Rotate the first ring to focus a beam on the Draco (The Serpent) constellation.
- Rotate the second ring to focus a beam on the Orion (The Hunter) constellation.
- Rotate the third ring to focus a beam on the Lyra (The Lyre) constellation.
Once all three are correctly aligned, the constellations will glow, and you'll hear a confirmation chime. The sequence is Draco, Orion, Lyra. Remember it.
Step 3: Use the Code on the Automaton Pianist
Your constellation sequence is not a numeric code, but a musical one. Head to the grand piano in the corner, where a deactivated automaton sits poised to play. Next to the keyboard is a small brass plaque that translates constellations into musical notes.
- Draco = B
- Orion = G
- Lyra = E
Interact with the piano and play the three keys corresponding to your sequence: B, G, E. You must play them in that order. If you play a wrong note, the sequence resets. After three failed attempts, the automaton will slump slightly, a minor narrative detail with no mechanical penalty.
Upon successfully playing the B-G-E sequence, the automaton will spring to life. It will perform a short, melancholic melody. As it finishes, a hidden compartment in the piano's music stand will open, revealing a piece of sheet music titled 'Thorne's Nocturne.'
Step 4: Decipher the Sheet Music and Crack the Safe
This is the final step. The melody the automaton played is a red herring. The real code is written on the sheet music it produced. Examine 'Thorne's Nocturne' in your inventory. You will see that three specific notes in the composition are circled in red ink: C4, A3, and F5.
Now, approach the Chronos Safe. The dial is not a standard 0-9 combination lock. Instead, it has musical notes (A through G) marked around its circumference. A small chart taped to the side of the safe provides the final translation:
- C = 1
- D = 2
- E = 3
- F = 4
- G = 5
- A = 6
- B = 7
The circled notes from the sheet music are your numbers. The order is the order they appear on the page, left to right. C4 becomes 1, A3 becomes 6, and F5 becomes 4.
The final safe combination is 1-6-4. Enter it into the dial. The heavy door will swing open, revealing the Lachryma Vial. Taking it completes the main objective for this area.
Momento in-game screenshot
Secret Objective: Finding All 3 Anamnesis Masks
Before you leave the loft, you have the opportunity to uncover a secret that directly impacts the game's ending. Three porcelain masks are hidden in the environment. Finding all three is the only way to unlock the file "Thorne's Confession," a prerequisite for the True Ending.
Momento in-game screenshot
Mask of Comedy Location
This mask is hidden behind the large oil painting of a ship in a storm, hanging above the fireplace. When you approach it, Kaelen will note that the frame is loose. Interact with the bottom right corner of the frame to swing it open, revealing the grinning Mask of Comedy in a recessed alcove.
Mask of Tragedy Location
Go back to the library alcove where you found the Sun Lens. On the bottom shelf is a row of thick medical textbooks. One is titled 'Hypnos & Thanatos'. Unlike the others, this book can be pulled from the shelf. It's a hollowed-out book box, and inside rests the weeping Mask of Tragedy.
Mask of Neutrality Location
Find the small, ornate wooden chest on a side table near the globe. The top of the chest has a simple 3x3 sliding tile puzzle. It's a picture of an ouroboros. The solution is straightforward, as the center piece is missing. Once solved, the chest will unlock, allowing you to collect the final Mask of Neutrality.
What the Masks Unlock
On the wall opposite the Chronos Safe, there are three empty hooks arranged in a triangle. Place each of the Anamnesis Masks on these hooks. Once all three are mounted, you'll hear a heavy grinding sound. A section of the wall beneath the masks will retract, revealing a hidden compartment. Inside is a single audio log and a file folder. This is "Thorne's Confession," the critical item for the True Ending path.
How Your Loft Actions Affect the Ending
Your choices in the Doctor's Loft are a major branching point for the narrative, though it may not seem obvious at the time. The game's conclusion is determined by whether you simply completed your objective or went the extra mile to uncover the truth.
- Standard Ending: If you only open the Chronos Safe and retrieve the Lachryma Vial before leaving the loft, you will be locked into the game's standard ending. You'll have the item you came for, but you'll lack the full context of Dr. Thorne's work.
- True Ending: To unlock the True Ending, you must find all three Anamnesis Masks and retrieve "Thorne's Confession" before you take the Lachryma Vial from the safe. Having this file in your inventory during the game's final chapters changes key dialogue and gives you an option that is otherwise unavailable.
The critical takeaway is this: do not leave the loft without the confession. Once you exit, you cannot return, and the True Ending will be permanently out of reach for your current playthrough.
Momento in-game screenshot
Frequently Asked Questions
Is the Doctor's Loft puzzle timed?
No, you can take as much time as you need to explore and solve the puzzles. However, after you retrieve the Lachryma Vial from the safe, a narrative event is triggered that rushes you to leave the area. This is why it's crucial to find the Anamnesis Masks and the confession before opening the safe.
What happens if I input the wrong piano code?
If you play the wrong notes on the piano, the sequence simply resets. There is no penalty or lockout. After three consecutive failures, the automaton will visibly slump, but this is purely a cosmetic, atmospheric detail and does not affect the puzzle.
Can I miss the Anamnesis Masks and come back later?
No. The Doctor's Loft is a one-time, sealed location in the narrative. Once you leave, the entrance is locked permanently. Any missed items, including the masks and the confession file, are gone for good in that playthrough.
What's the reward for completing the Doctor's Loft?
The primary reward is the Lachryma Vial, a main quest item required to progress the story. The secondary, optional reward is the file "Thorne's Confession," which is not an equipment item but a key narrative component that unlocks the path to the game's True Ending.
Final Take
Dr. Thorne's loft is a masterclass in environmental storytelling, wrapping its secrets in a satisfyingly complex, multi-layered puzzle. While the main path to the Chronos Safe is a clever sequence of logic puzzles, the real prize is the hidden narrative unlocked by the Anamnesis Masks. For players invested in Momento's world, finding Thorne's Confession isn't just a side quest—it's the definitive way to experience the story.