Tenebris Somnia demo walkthrough
The demo is a free download, not a browser game. Steam app 2578120 is linked from the main store page. It covers the opening apartment, lasts roughly 20–30 minutes according to Polygon and AbsoluteGamer, and you cannot save.
Last checked 2026-10-18.
| Where | Steam app 2578120, plus GOG and Xbox. Updated when the full game launched on October 16, 2026. |
|---|---|
| Length | About 20–30 minutes in press previews. No official runtime was published. |
| Stops | After the long-tongued enemy, an elevator, a filmed woman handing over a lighter, and an ambush. Not the first boss. |
| Saves | None inside the demo, per Polygon and AbsoluteGamer. |
What the route feels like
The demo route is the same first rooms as the full walkthrough, and then it takes the elevator away from you. I followed the press descriptions rather than a current timed run of my own: wrench, first enemy, wax-sealed study if you get that far, then the cutscene with the lighter and the second creature waiting outside the elevator. People who expected Candlehead from the demo reviews of older builds will not meet that fight here.
What changed in demo 0.4
The Steam announcement for February 24, 2025 lists the v0.4 demo changes: faster wrench attacks, higher revolver damage and fire rate, random knockback, ranged attacks that start after you are hit, improved cutscene picture and sound, interaction only when you face the object, Labendoleum restoring less sanity, named speakers with colored boxes, and the removal of the in-game language menu. The full game’s item is spelled Lavendoleum on the achievement. Both spellings are in official text. Use the one your build shows.
Demo versus the full game
The retail game adds floors the demo never opens: Floor −1, the film school, the hotel, and Septimo Arte. Weapons progress past the wrench into the revolver, the shotgun, the pipe, and Aurifer. There are four endings. Ammunition pressure and the number of filmed scenes are both higher. The demo’s cliffhanger is the sales pitch, not a sample of the last boss.
Questions people ask
How long is the Tenebris Somnia demo?
Press previews say about 20–30 minutes. There is no official number, and you cannot save.
Does the demo include the first boss?
No. It ends at the ambush after the elevator cutscene. The candle-arena boss is in the full game.
Where do I download the demo?
Steam app 2578120 from the main store page, or the demo buttons on GOG and Xbox. Links are on the download page.
Keep reading
Sources
- Steam store — Demo button and app 2121510
- Steam demo app — App 2578120
- Steam news for the app — v0.4 demo notes. The 20–30 minute figure is from Polygon and AbsoluteGamer previews and has no official timer.