Tenebris Somnia Full Walkthrough

Tenebris Somnia is a single continuous progression: Iván's 3rd-floor apartment on Floor 3, descent through the Séptimo Arte complex and the film school, Floor -1, the Desiderium dream layer, then the Aurifer Knife and the sprint to Séptimo Arte for whichever ending you chose.

This page walks the route floor by floor, then the Aurifer chain and ending branch. Detailed standalone pages cover each puzzle and boss.

You start the run on Iván's 3rd-floor apartment. The Floor 3 entrance to the film school sits across the hall.

1. Pick up the Wrench from the bathroom (blue door by the Devora poster).
2. Pick up the Developing Chemical from the kitchen.
3. Pick up the Glass from the nightstand in the bedroom.
4. Use Glass on the broken mirror to make Glass with Blood.
5. Combine Glass with Blood + Developing Chemical to make the Chemical-Blood solution, then combine again with the Wrench's interaction to get Auritsatio.
6. Use Auritsatio on the boarded Study Door to clear it.
7. Inside the Study, complete the Door Puzzle (sequence matches the bottle puzzle tone test — see bottle puzzle) to progress to Floor 2.

On a return visit later in the run, the Floor 3 bathroom holds the Silver Key cabinet and the Hexagonal Stone drawer.

Floor 2 becomes the main hub. Solve the TV Remote puzzle and prep the Devora poster chain.

TV Remote puzzle

1. Pick up the Glove from the clothes rack right of the laptop desk in Iván's office.
2. Use the Glove on the circuit breaker in front of you to kill power.
3. Take the first Battery from the kitchen.
4. Get the second Battery from the bathroom tub curtain.
5. Ride the elevator to Floor 3, enter the first version of Iván's apartment.
6. Use both Batteries on the TV remote.
7. Back on Floor 2, press the matching floor symbols on the now-powered TV remote to unlock the door right of the TV. The symbol sequence is randomized.

Devora poster chain (Scissors + Lighter + Bathroom Key)

1. Pick up Scissor Blade #1 from the kitchen counter.
2. Pick up the X-Ray (A.S. Key file) from below the front door. Combine Scissor Blade #1 + X-Ray to make the A.S. Key.
3. Pick up Scissor Blade #2 from the director's office desk.
4. Combine both Scissor Blades into the Scissors.
5. Use the Scissors to cut the poster cutouts in the hallway — collect six Cardboard Pieces.
6. Reconstruct the Devora poster in the director's office by placing the six pieces back into the frame.
7. Burn the Devora poster (use the Lighter) to drop the Bathroom Key.
8. Use the Bathroom Key on the bathroom left of the director's office to get the Mop Handle.
9. Use the Mop Handle against the wall square by the windows of the Floor 2 apartment candle arena to unlock the next area.

The Film Canisters chain and the Floor 2 director's office desk are detailed on scissors weapon and film canisters.

Floor 2 — Ivan statue (later chain)

The Iván statue holding a knife on Floor 2 is the start of the Lapis Fictus Knife chain (use the Auritsatio spray on the statue). See knives.

Floor 1 is the largest single-floor block. Work in this order:

1. From the elevator, go right to Door 6 and into the dining room.
2. Take the 3rd door on the right and ascend the stairs to pick up the USB Adapter near the boarded door.
3. Combine USB Adapter + USB Cable (dropped by the bottle puzzle bell) into the USB Charger.
4. Back on Floor 3, enter the purple door left of the broken TV and use the USB Charger near the wall outlet and phone.
5. On Floor 1, go left to Door A and input the code from the Old Book to enter the projector room.
6. In the projector room, play Devora 1 Film Canister (from Iván's Floor 2 chest) on the projector to unlock the first metal box in the theater.
7. Pick up the Black Tape from the left door after ascending from the dining room.
8. Pick up the Plate with X from the left-most box in the theater. Combine Black Tape + Plate with X for the Dinner Plate puzzle, then use the result on the dining-room double door.
9. Pick up the Green Square Stone from the dining-room double-door chest. Use it on the green-symbol door on Floor 3 apartment.
10. After the green symbol door, pick up the White Candle from the left dresser of the Floor 3 apartment.

Electrical current puzzle room

11. Enter the green door puzzle room on Floor 1.
12. Interact with the bottom left switch — wait for the gate.
13. Interact again, then run to the bottom right switch before the gate lowers.
14. Grab the Piece of Cable from the opened top box.
15. Use the Piece of Cable on the upper left switch (in the up position).
16. Interact with the bottom left switch again — a statue collapses and drops the RCA Cable.
17. Use the RCA Cable on the camera in the cinematography room.

See the electrical current puzzle page for the exact switch order and the Floor 0 / Ground Floor variant.

Cinema class chain

18. After color-inversion on Floor 0, use the Yellow RCA Cable on the camera, then interact with the rope.
19. Use the lever on the bottom left, wait for the gate, interact again to turn off the current — the box is safe to reach.
20. The Copper Seed (green) drops from the bird on the broken camera window. Use it on the Floor 1 green vase to grow Flowers.
21. Use the Flowers on the female figure outline in the Cinema Class.
22. After the outline collapses, the male statue suicides and drops the Copper Key.

TV Room (Floor 1)

23. Enter the TV Room via the Copper Key door — see TV room puzzle for the dark-navigation steps and the Vorax ambush.
24. Note the color pattern shown on the TVs in the Old Book (you'll need it for the elevator).
25. Grab the Black Candle from the desk.
26. Exit and combine the Lighter with the Black Candle to light it.

Cursed Film Canister (early chain)

27. Enter the Floor 1 blue-door room and interact with the Cursed Film Canister.
28. Interacting teleports you to the film studio lobby.
29. Return and interact again — you teleport a second time. Sanguis appears in the lobby chair.
30. Talk to Sanguis and exhaust dialog with the SPELL option until the Old Book updates and you receive the Silver Key.
31. Use the Silver Key on the Floor 2 bathroom cabinet to get the Silver Bottle.
32. Use the Silver Bottle on the three save points (Floor 2 bedroom save, Floor 3 office save, Floor 2 director's office save) to fill it with three doses of water.

The full Film Canisters chain — including how the third can is purified after Fumus — is on the film canisters page.

1. Light the Black Candle (already lit after the TV Room step above).
2. Use the lit Black Candle inside the elevator on Floor 1 to trigger the puzzle sequence. See elevator puzzle.
3. Read the color pattern from the Old Book — the pattern is randomized; the colors stay attached to the floors (3F blue, 2F green, 1F red, Ground white) and the floor order changes.
4. Ride each floor in the book's order until the elevator becomes corrupted, then select Floor -1.
5. On Floor -1, run through the corridors, break the glass windows, and push the obelisks to reach Iván's childhood room.
6. Pick up the second Film Canister from the Ivan statue in his childhood room.
7. Play it on the projector to unlock the second metal box in the theater, which drops the Cow Skull.

After Floor 1's deeper puzzles (post-projector, post-Cinema Class), you reach the Animal Skull Key door. Inside the candlelit arena is Fumus — see Fumus fight for the red-circle strategy.

1. Defeat Fumus.
2. Pick up the red Pentacle Stone dropped by Fumus.
3. Use the Pentacle Stone on the white Hotel room door with the red symbol.
4. Exhaust the dialog with the Julia statue.
5. Use the Bottle With Three Doses on the window to purify it with moonlight → Purified Water.

Now that you have Purified Water, run the photo development chain to get the Hexagonal Stone — see photo development puzzle for the 12-step sequence.

1. The Photo Roll is in the Floor 1 theater lobby.
2. The Lightbulb is in the lamp in the left corner of the photo developing room.
3. After Fumus, use the Pentacle Stone on the Floor 3 Iván bathroom door to get Chemicals.
4. The Red Lightbulb comes from the bloody table in the staircase-above-dining-room area (Cold Chisel needed to enter).
5. Use the Red Lightbulb on the lamp in the photo developing room.
6. Use Chemicals on the trays above the lamp.
7. Use Photo Roll on the northernmost center table.
8. Use Negative on the left table.
9. Use Photo Paper immediately after.
10. Use Printed Photo at the chemical trays.
11. Use the resulting Photo on the framed table in Iván's bedroom to unlock the drawer.
12. Take the Hexagonal Stone from the drawer.
13. Use the Hexagonal Stone on the Floor 2 film school symbol door to progress.

1. Return to the Cursed Film Canister room in the Floor 1 blue-door room.
2. Use Purified Water on the Cursed Film Canister to obtain the third/final Film Canister.
3. Play it on the projector to unlock the third metal box, which contains the Cold Chisel.
4. Use the Cold Chisel on the boarded door at the top of the staircase above the dining room.
5. Enter the boardfight and fight Carnitos — see Carnitos fight.

After Carnitos, the Tin Key drops on a wire. This unlocks the Desiderium hallway. Work through:

1. Tin Key — opens the Desiderium hallway and unlocks the Green Candle box in the Desiderium theater center.
2. Combine Green Candle + Lighter to access Floors 2 and 3 of the dream.
3. Lead Fly — drops from the broken Julia statue after the Desiderium fly puzzle. Opens the door with the fly insignia.
4. Glass Vase — from the Floor 3 plant vase during Desiderium. Combine Glass Vase + all three Film Canisters.
5. Photograph set — from the clothes rack in the Floor 2 office. Use the Photographs on the Floor 3 wall with roman numerals for the poem puzzle — see Desiderium poem puzzle for the correct photo per poem.
6. Circular Plate — drops from the oven after using the Vase Filled With Chemicals And Blood + the Lighter.
7. VHS Tape — from the chest in Iván's Floor 2 office once the Circular Plate is used.
8. Julia Figure / Ivan Figure — figures in the Glass Box, pulled from the bedroom photo / TV ambush.
9. Auritsatio spray (full) — from breaking the studio light with the Vase Filled With Chemicals And Blood during Desiderium.

After the dream chain:

1. Lapis Fictus Knife — back in Iván's living room on Floor 2, use the Auritsatio spray on the Iván statue holding a knife. See knives.
2. Melanosis Knife — exit the apartment and use the Lapis Fictus on the fusebox in the kitchen (reached via the bathroom hole in the broken wall).
3. Virdis Knife — sprint through the Relicta ghost corridors using the Ladder to descend, then use the Melanosis Knife on the mercury puddle in the kitchen area.
4. Aurifer Knife — in the Studio Lobby, use the Lead Key (drops from the TV after the Aurifer Knife sequence) on the symbol door, walk north through every door to the locked Hotel door, and use the Virdis Knife. The cutscene grants the Aurifer Knife.

After the Aurifer is collected, you choose between Good and Bad — see endings.

Good ending (SOLVE ET COAGULA / Lacuna)

1. Do not kill Relicta ghosts with the Aurifer.
2. Sprint past them through the Hotel doors back to the Studio Lobby.
3. Exit to the hallway, take the furthest-right door to the staircase.
4. Climb to Floor 3, enter the apartment hallway.
5. Far left, go through the door with the water puddle.
6. Left in the street to the Séptimo Arte building with the Relicta ghosts and enter the building.
7. The final boss fight (Lacuna) plays.

Bad ending (MAGNUM OPUS / Hermes)

1. Kill several Relicta ghosts with the Aurifer on every floor along the route.
2. To unlock Heart of Lead, kill Relicta on every floor (not just the path), avoid multikills, and wait for the gold particles to clear between kills.
3. Continue to the Séptimo Arte building for the final boss (Hermes).

The same save before the Aurifer Knife can branch into both endings; reload after the Aurifer to switch.

These achievements are tied to the walkthrough order. Plan them in advance because missing one blocks the rest of the run:

• Maybe He's In The Bathroom — interact with Iván's closed door 10 times at the very start.
• Classics Never Die — pick up the Iron Pipe with the Screwdriver from the film reel viewing area.
• Stella Plena — open all 6 star lockers before the Sanguis beast-form boss.
• Heart of Lead — kill Relicta ghosts on every floor on the Bad ending route only.
• Iron and wax / Exhaust Pipe — Wrench-only Obscuratus or Pipe-only Fumus; can't do both.
• Butcheress / Valiant Little Taylor — Carnitos fight rules.
• Acrophobia / Devoured — die during Lacuna Phase 1 / Hermes Phase 2.
• Bad Puppy — bait Sanguis into mannequins before killing.

The complete list and trade-offs are on the achievements page. The combat-loadout rules behind most of these (weapon-aware circles, environmental kills, end-of-run saves) are on the combat strategy page. The full item pickup list is on the item locations page.