Charge Ivan's phone for code 5160, screen Débora, then place the X plate and Black Tape to unlock the Square Stone. The Tenebris Somnia first floor has you going back and forth between the filming location behind Door 6 and the cultural center behind Door A, plus one trip back to Ivan's apartment to charge his phone. You need the USB cable from the bar near Septimo Arte and the USB Adapter from the filming-location staircase.
How do you solve the USB cable bottle sound puzzle?
Match the glass apparatus's tone to the bar bell by adjusting its liquid, then ring the bell again to release the USB cable. The numbered bottles change the amount of liquid inside; hitting the glass with your Wrench lets you hear its current pitch.

- Go to the symbol door just left of the third-floor elevator and use the blue Triangular Stone. Outside, head left and collect the Bottle before entering the bar.
- Collect the remaining Bottles from the table, behind the bar, and in the bathroom.
- Interact with the bell at the counter and listen to its tone. This is your target sound.

- Stand next to the glass apparatus and use Bottles from your inventory to add liquid. Use empty Bottles to remove liquid.
- Strike the apparatus with your Wrench after each adjustment and compare the pitch with the bell. Keep adjusting the liquid until the sounds match.
- Return to the bell and ring it again. The glass shatters, letting you collect the USB cable.

The bottle order is randomized, so work from the sound in your game. Repeated Wrench hits alone will not break the apparatus open: the liquid level must produce the bell's pitch before you ring the bell again.
How do you solve Ivan's phone USB charger puzzle?
Combine the USB cable with the USB Adapter to make a USB Charger, then use it beside Ivan's phone and the wall outlet in his apartment.
- Take the elevator to the first floor and enter Door 6 on the right.
- Walk to the far right of the room and interact with the doorway where light shines through to reach the dining room.
- Enter the third door on the right, then climb the staircase to the top. Pick up the USB Adapter near the boarded-up door.

- Combine the USB cable and USB Adapter in your inventory.
- Return to Ivan's apartment on the third floor. Enter the purple door left of the broken TV, then move to the right side of the room.
- Stand beside the phone and wall outlet and use the USB Charger. The phone turns on and gives you the projector-room combination, which Julia writes in the Old Book.

What is the Débora screening room code?
Enter 5160 at the locked projector-room door inside the cultural center behind first-floor Door A; check the Old Book for the code recorded from your phone.

Take the elevator back to the first floor, go left, and enter Door A. Inside the cultural center, the locked door on the left leads to the projector room. The large double doors ahead lead to the theater, where you will collect your reward after the screening.

How do you finish Débora's premiere and get the Plate with an X?
Use the Débora 1 Film Canister on the 16mm projector, watch the screening, then collect the Plate with an X from the leftmost metal box in the theater.
If you still need the canister, get it from the chest on the left side of Ivan's office on the second-floor walkthrough route. Bring it back to the unlocked projector room and use it while standing beside the projector.

After the screening, go downstairs to the cultural-center entrance room and through the double doors at the top of the screen. Inspect the open box on the left beneath the theater screen to take the Plate with an X. You need this reward for the dining-room puzzle, so collect it before leaving.

How do you solve Débora's Plate with an X puzzle?
Use Black Tape on the upper-left dining plate and place the Plate with an X in the empty spot directly beneath it to unlock the central double doors.

- Return to first-floor Door 6, go to the far right, and take the lit doorway back to the dining room.
- If you need Black Tape, enter the third door on the right and climb to the first door on the staircase. Go inside and head left to collect the tape from the counter.

- Return to the dining table. Use Black Tape on the leftmost plate in the upper row to make the other X.
- Use the Plate with an X on the missing setting immediately below that plate.
- Enter the now-unlocked central double doors and collect the green Square Stone.

The premiere and dining-room sequence leave you with the Square Stone for the green symbol door. Return to Ivan's apartment walkthrough, go all the way right to that door, and use the stone to continue; the White Candle is inside on the left dresser.