Tenebris Somnia Walkthrough: All Puzzles, Bosses, and Endings

Tenebris Somnia rarely points you toward the next door. Items pile up without labels, several puzzles reshuffle on every save, and one missed bottle can stall an entire floor — which is why a structured Tenebris Somnia walkthrough is worth keeping open. This Tenebris Somnia walkthrough follows Julia from her first steps inside Ivan's apartment to the final choice that splits the endings, in the order the game actually expects you to play.

The live-action-meets-8-bit survival horror from Saibot Studios arrived on October 16, 2026, and it is available on the official Tenebris Somnia Steam page. If you only played the free demo, expect a much longer route: the demo's chemical door puzzle is barely the tutorial for what follows.

Combat and Inventory Basics for Your Tenebris Somnia Walkthrough

Julia has four health points and no room for sloppy trades, so treat each encounter as a turn-based fight running in real time. Let the enemy commit to an attack, step out of range during the wind-up, then close in for one safe hit before backing off. A wrench kills the earliest creature in about three or four connects, and chasing a retreating enemy usually costs more health than it earns.

Lavendoleum, the small purple bottle, restores a single health point, so check cabinets, containers, and star-locked boxes rather than hoarding. The bar bathroom hides the Iron Pipe, which doubles your melee reach compared with the wrench and stays useful long after the first boss. Keep the Old Book close, too: it logs projector codes and TV color sequences, and every entry can be re-read when a later puzzle asks for it.

Randomized puzzles are the other thing to plan around. The bar pitch puzzle, the elevator color order, and the fly tile route all differ between playthroughs, so this Tenebris Somnia walkthrough explains the logic of each rather than handing you a fixed code that will not match your save.

Third Floor and Second Floor: Opening Puzzles and Candlehead

The chemical mixture that unlocks the Study Door

Collect the Old Book, then the Empty Glass from the bedroom nightstand, the Photo Developing Chemicals from the kitchen refrigerator, and the Wrench from the bathroom. Wrench the boards off the bedroom window to let sunlight in, then use the glass on the bloody bathroom mirror — blood supplies the iron the recipe needs — and combine it with the chemicals.

Take that mixture to the exposed window to brew Auritsatio, which opens the locked Study Door. The mirror step is where most blind runs stall, so try it before you start pairing random objects.

Batteries, the remote, and the A.S. Key

Enter the second-floor apartment on the right. Grab the Rubber Glove from the clothes rack in the office and use it on the kitchen fuse box, which shuts the power off and frees the first Battery from the washing machine. The second Battery hides behind the bathtub curtain in the bathroom.

Use both batteries on the TV remote in the third-floor office. The downstairs television displays a tile pattern — copy it by stepping on the tiles in the same order to open the bedroom, then loot the closet for revolver ammo. The Blue Triangular Stone, found near the candle arena beyond the bedroom window, unlocks the blue symbol door beside the third-floor elevator. Inside, use the Scissor Blade from the kitchen counter and the X-Ray from the bookshelf near the front door to push the A.S. Key out of its lock.

Poster cutouts, the mop, and Candlehead

The director's office holds the second Scissor Blade; combine both halves into Scissors. Cut the six mismatched cardboard cutouts in the hallway for six Cardboard Pieces, rebuild the Devora poster in the office, then burn it with the Lighter. Take the Mop Handle from the bathroom and use it at the candle arena square beside the window to drop the blinds.

That summons Candlehead, who is invisible until you extinguish every lit candle in the room. Attack during the vulnerable window, retreat when it winds up its area burst, and never chase it across the floor. Its Red Candle, lit with the Lighter and placed inside the elevator, unlocks the first floor.

First Floor and Film School: USB Charger, Projection Room, and Electricity

Match the bell in the bar

Four Bottles are needed: one outside to the left, one on a table, one behind the bar, and one in the bathroom. Ring the bell and memorize the tone, then pour bottles into the giant glass pitcher and strike it with your wrench to hear its pitch. Empty bottles remove liquid if you overshoot.

The correct amount is randomized, so keep adjusting by ear. Once the pitcher matches the bell, ring it again and the glass shatters, leaving the USB Cable on the floor.

Build the USB Charger and open the Projection Room

On the first floor, head right through the lit doorway into the dining room, then take the third door on the right to the staircase. Grab the Black Tape from the counter behind the first door, and the USB Adapter from the top of the stairs near the boarded-up door. Combine adapter and cable into the USB Charger.

Charge Ivan's phone behind the purple door left of the broken TV in the third-floor apartment to reveal the door code, which is also written into your Old Book. Enter it at Door A on the first floor.

Dinner plates and the Green Square Stone

Play the Devora 1 Film Canister in the projector (the canister sits in the chest in Ivan's second-floor office) and the theater's left metal box opens, yielding the Plate with X. Back in the dining room, apply the Black Tape to the upper-left plate and the Plate with X directly beneath it. The center double doors open onto the Green Square Stone.

Use the stone on the green symbol door in the third-floor apartment, take the White Candle from the dresser, light it, and ride down to Floor 0.

Electrical current puzzle and the Cinematography camera

Upstairs in the Film School, the green door leads to the electrical room. Hit the bottom-left switch, wait for the gate to rise fully, hit it again, then sprint to the bottom-right switch before the gate drops — glowing cables shock you on contact. The box at the top opens for the Piece of Cable; install it on the upper-left switch, then reactivate the bottom-left switch to burst the statue and claim the Yellow RCA Cable.

Use it on the camera in the Cinematography Class and cycle the feed: match the female outline's pose, smash the glass she pushes against, wait for the bird carrying the Copper Seed, grow flowers in the green vase down the first-floor hallway, place them on the figure, and take the Copper Key from the fallen statue's seat.

TV Room and the elevator sequence

Switch on every TV, survive the Vorax ambush, and the color pattern is recorded in your Old Book. Grab the Black Candle from the desk and light it. Then place it in the elevator and visit floors in the recorded order, reading top to bottom.

The order is randomized, and the elevator corrupts a little more with each correct stop. Finish the sequence and Floor -1 appears on the panel.

Floor -1, Fumus, and the Three-Canister Chain

Head right through Floor -1, break the glass windows, shift the obelisks, and reach Ivan's childhood bedroom for the second Film Canister. Playing it opens the theater's second metal box, which holds the Cow Skull. Use the skull on the white door at the far left of the first-floor hallway, reached through the dining room staircase.

Fumus, the tall faceless woman, rewards patience: stay at range to bait her slam, step out of the impact zone, and punish the recovery. She cannot be damaged while ringed in red, and the circles spreading across the floor make Julia turn the revolver on herself, so keep moving.

Her Red Pentacle Stone unlocks Ivan's third-floor bathroom and the red-symbol door in the Film Studio Lobby. Speak with Sanguis, choose the SPELL dialogue until he gives you the Silver Key, unlock the cabinet beside the second-floor sink for the Silver Bottle, then fill it at three save points.

Moonlight at the hotel window purifies that water, and the purified water cleanses the cursed canister on the Film School's first floor. Play the third canister for the Cold Chisel, pry the boarded door open with a melee strike, and swap the photo room's bulb for the Red Light Bulb to start the development puzzle: lamp, chemical trays, Photo Roll, Negative, Photo Paper, then the printed photo back on the trays. The finished photo goes in the frame beside the bed for the Hexagonal Stone.

Desiderium: Fly Puzzle, Candle Locks, and the Aurifer Knife

In Desiderium, the Fly puzzle asks you to memorize the tiles you stepped on in the first room and repeat that exact route in the second, where the statue turns gold as you go. The route is randomized, so walk it carefully once. The Lead Fly from the theater opens the fly-marked door, and after Carnito falls you grab the Tin Key from the wire and trade it for the Green Candle.

The Aurifer chain is long but linear: statue and faucet interactions, Glass Box, Photographs, the flooded stairwell wall, the Glass Vase combined with your canisters, the poem wall, the oven, the Circular Plate, the VHS Tape, and a TV-only wave fight. The poem answers below are community-reported and depend on each poem's opening line.

After the Lapis Fictus, Melanosis, and Viridis knives, the Viridis Knife on the Hotel Door grants the Aurifer. If you are following this Tenebris Somnia walkthrough for one playthrough only, save at that door: the ending splits here.

How to get both main endings

• Solve et Coagula (good): never kill a Relicta ghost with the Aurifer. They cower once you hold it, so simply walk past.
• Magnum Opus (bad): kill a single Relicta with the Aurifer — one is enough.

Reload the save afterward to see the other route without a replay. The final area is the Septimo Arte building, reached by taking the third-floor hallway left to the theater door and following the street. Prima Games' complete walkthrough notes four endings in total, including a secret true ending reserved for New Game+.

FAQ

How long is Tenebris Somnia? Plan for a full-length survival horror campaign rather than the demo's 30 to 60 minutes. Puzzle-heavy floors, backtracking for items, and boss retries add most of the time.

Is this Tenebris Somnia walkthrough safe for spoilers? It names items, rooms, and boss mechanics but skips plot context, so you can use it as a stuck-check without spoiling the live-action scenes.

Why doesn't the elevator code in this guide work for me? Because it is randomized. Your Tenebris Somnia walkthrough sequence lives in the Old Book entry recorded in the TV Room — copy that order, not someone else's.

Can I miss the good ending? Yes, and permanently, unless you reload. Killing even one Relicta with the Aurifer locks you into the bad route, so save before the Hotel Door and keep your hands off the ghosts.