Tenebris Somnia Demo — What It Covers and How It Differs from the Full Game

The standalone Tenebris Somnia Demo (Steam app ID 2578120, released September 6, 2023) is a vertical slice of the full game. It is not the same product as the October 16, 2026 release.

• Iván's 3rd-floor apartment door puzzle (Wrench + Developing Chemical + Glass combined into Auritsatio and used on the Study Door).
• Early film-school encounters that lead into the first boss (Obscuratus in the candle room).
• A first look at the 2D pixel-art gameplay and the live-action cinematics.

The demo stops at the early film-school encounters and the first boss. It does not include:

• The full Desiderium chain (Tin Key, Green Candle, Lead Fly, Glass Vase, Aurifer Knife chain).
• The Aurifer Knife forging and the post-Aurifer sprint.
• Any of the four endings (SOLVE ET COAGULA, MAGNUM OPUS, VIVUS EX MORTIBUS, RENUNTIATIO).
• The second and third Film Canisters (only the Devora 1 area is shown).
• The Floor -1 chase (Sanguis beast form), photo development puzzle, or Desiderium poem puzzle.

Progress and unlocks in the demo do not carry over to the full release. The demo is a clean-slate preview; you start a new save when you launch the October 2026 build.

For the full game's continuous progression, see the full walkthrough. For just the early-floor puzzle chain the demo mirrors, see the Wrench weapon page and the Obscuratus fight page.