This The Sinking City 2 demo walkthrough covers the Prologue demo that has been live on Steam since 10 Jun 2026, running through the Devil's Reef safe code puzzle. The safe code answer is documented by TechRaptor and Into Indie Games. The demo is the cleanest way to test inventory management, boat navigation, and the red weak-point mechanic before the main game launches on 18 Aug 2026. Progress does not transfer to the main game; the demo is a prologue ending at the act-one opening beat.
Sources
[The Sinking City 2 on Steam](https://store.steampowered.com/app/2825860/The_Sinking_City_2/) - `official/store` - checked `2026-08-18` - Prologue demo availability since 10 Jun 2026, AppID 2825860, free demo listing, and 14 interface and subtitle languages. [TechRaptor - The Sinking City 2 Devil's Reef safe code guide](https://techraptor.net/gaming/guides/sinking-city-2-devils-reef-safe-code) - `media/interview` - checked `2026-08-18` - Step-by-step Devil's Reef safe code puzzle answer and surrounding prologue walkthrough. [Into Indie Games - The Sinking City 2 demo walkthrough](https://intoindiegames.com/walkthroughs/the-sinking-city-2-walkthrough-demo) - `media/interview` - checked `2026-08-18` - Complete Prologue demo walkthrough including the Devil's Reef safe code and the prologue chapter sequence. [Frogwares YouTube channel](https://www.youtube.com/@Frogwares) - `official/store` - checked `2026-08-18` - Prologue demo announcement, demo platform and demo length context, and main game launch cross-reference.