Tenebris Somnia Door Tools: Every Key, Stone, and Item That Opens a Lock

No sealed door in Tenebris Somnia opens with the obvious key — most want a stone, a lit candle, or a chemical mixture you have to brew yourself. That is why tracking Tenebris Somnia door tools matters: the apartment building is a maze of Ivan's memories, and each floor gates progress behind a different item. This guide lays out the Tenebris Somnia door tools floor by floor, so you spend your time exploring instead of rattling locked handles.

Tenebris Somnia is the Argentine survival horror game co-created by Andrés Borghi and Tobías Rusjan with Saibot Studios, published by New Blood Interactive. If you want the official overview before diving into locks and keys, see Tenebris Somnia on Steam.

How Tenebris Somnia Door Tools Work

Almost every locked door in the game belongs to one of four families. Recognizing which one you're looking at saves a lot of guessing.

• Inventory keys — physical items such as the Apartment Key or the A.S. Key. These usually drop straight into the lock with no extra steps.
• Symbol stones — a colored stone socketed into a matching symbol. The Blue Triangular Stone is the earliest example.
• Candle seals — a candle, lit with the Lighter, pressed against a wax symbol on a wall or doorframe.
• Crafted tools — multi-step mixtures and improvised implements like Auritsatio or the Cold Chisel.

One rule is worth memorizing: symbol stones are reusable. The walkthrough at Into Indie Games confirms the same Blue Triangular Stone opens every blue door you meet after the first. Never assume a stone is spent.

Floor 3: The Auritsatio Chain

The Study door in Ivan's apartment is your first real test of Tenebris Somnia door tools, and it takes five pickups before it will budge.

1. Enter Room B with the Apartment Key and grab the Old Book outside the bedroom door.
2. Take the Empty Glass from the bedside cabinet.
3. Pull the Developing Chemical from the kitchen fridge.
4. Take the Wrench from the bathtub in the bathroom.
5. Use the Glass at the cracked mirror to collect Glass with Blood, then combine it with the Developing Chemical.

Now return to the bedroom, pry the bottom board off the window with the Wrench to let daylight in, and use the mixture near the glass. That produces Auritsatio, which melts the red seal on the Study door.

Two practical notes. The Wrench doubles as your first melee weapon — three or four hits kill the first monster, so keep it equipped. And Auritsatio is a one-purpose item; there is nothing else to save it for.

Floor 2: Stones, Keyholes, and the Lighter

Floor 2 introduces the symbol-stone family. Walk through the bedroom window into the candle area and pick up the Blue Triangular Stone lying on the ground (the Red Candle there will not move yet — that comes later). From then on, any door carrying that triangular symbol, including the one directly left of the elevator, opens with the stone.

The next door tool is the trickiest to describe because walkthroughs disagree on the order. At the A.S. door, a key is stuck in the keyhole from the other side. Both Into Indie Games and Prima Games agree the answer is the X-Ray plus a Scissor Blade used together; one source lists the X-Ray first, the other the blade. Try the pair and the A.S. Key drops free.

Past the A.S. door you reach the Director's Office and the six-piece cardboard poster puzzle. Combine the two Scissor Blades into Scissors, collect all six Cardboard Pieces, and arrange them. Burn the finished poster with the Lighter to claim the reward. Into Indie Games reports a Bathroom Key; Prima Games describes receiving the mop itself. Either way, the bathroom to the east is where the Mop Handle waits — the lever you need for the Candlehead boss.

Stone Keys and Candle Seals

Mid-game doors lean on two things: colored stones and lit candles. The Green Square Stone comes from the central double doors of the first-floor dining room, which open only after you place the Black Tape and the Plate with X on the correct display plates. Carry that stone back to Ivan's third-floor apartment and it opens the green-symbol door, where the White Candle sits on the dresser.

Candles do not work as door tools until you combine them with the Lighter in your inventory. Light one, then press it against the matching seal:

• Red Candle — the red symbol on the ground-floor stairwell wall
• Green Candle — the green symbol on the stairwell, unlocking Floors 2 and 3
• White Candle — the route down to Floor 0
• Black Candle — the elevator puzzle that reveals Floor -1

The Black Candle puzzle uses the color sequence recorded from the TV Room, so keep that page of your Old Book handy. Prima Games lists the mapping directly:

Player experience matters here: community walkthroughs note the color order is randomized per playthrough, so a sequence copied from a video will not work in your save.

Late-Game Tenebris Somnia Door Tools

The final stretch swaps chemistry for found objects and a little photography.

The Hexagonal Stone, earned by developing a photo and placing it in the bedroom frame, opens both the kitchen and the Film School door. The Cold Chisel from the Third Film Canister is not a key at all — lodge it in the door upstairs and strike it with your melee weapon. The Cow Skull from the theater's second metal box opens the first-floor door near where you found the Black Tape, which is also where Fumus, the Tall Faceless Woman, waits. Beating her yields the Red Pentacle Stone, described as opening a couple of new doors.

Other late-stage Tenebris Somnia door tools include:

• The Lead Fly, earned by breaking the golden fly statue, which opens the fly-symbol door.
• The Tin Key, hanging from a wire after the Carnito encounter, which unlocks the nearby door.
• The Lead Key, dropped after the mercury room, which opens the locked Film Studio Lobby door.
• The Viridis Knife, which triggers the Hotel Door cutscene and hands you the Aurifer.

Finally, the USB Charger — a USB Cable from the bar's glass pitcher puzzle combined with a USB Adapter found at the top of the first-floor stairs — powers Ivan's phone in the third-floor apartment. Read the code, then enter it at the locked door inside Door A on the first floor. Forgetting the code is not a dead end; your Old Book stores it.

FAQ

What is the first Tenebris Somnia door tool I need to craft? Auritsatio. It requires the Empty Glass, the Developing Chemical from the kitchen fridge, blood from the bathroom mirror, and a sunlit window opened with the Wrench.

Can I reuse the Blue Triangular Stone on later doors? Yes. It is not consumed, and it opens every blue door bearing the triangular symbol for the rest of the game.

How do I open the green-symbol door in Ivan's apartment? Collect the Green Square Stone from the center double doors of the first-floor dining room, then bring it to the third-floor apartment. The White Candle is inside.

Do candles work as Tenebris Somnia door tools without a flame? No. Combine the candle with your Lighter in the inventory first, then use the lit version at the matching seal.