The Thirteenth Room

The doors of Blackthorn House are about to reopen. Twelve guest rooms appear in the brochure—but the old deeds preserve a thirteenth room. Over dinner, an architectural folio disappears, a facsimile loses its appendix, and three carefully altered records begin to tell the same misleading story.

Your evening in the mansion

Gather your fellow investigators, pour a favourite drink and settle in. Meet six characters with histories worth questioning, examine the illustrated evidence and follow eighteen connected questions from the first missing measurement to a conclusion you can defend together. Play alone or as a group, without a host or outside research.

This substantial Master Case combines six illustrated evidence questions, three riddles with graphs, six puzzles and three deductions. Work at your own pace; gradual hints are there when you need them.

Choose your language edition

English: The Thirteenth Room · Nederlands: De dertiende kamer · Deutsch: Das dreizehnte Zimmer · Français: La treizième chambre.

Each language edition includes a substantial illustrated investigation with eighteen connected questions, separate gradual hints, worked answers and ending, accessible evidence descriptions and start instructions. Choose English, Nederlands, Deutsch or Français; one language edition per purchase.

Supplied as one ZIP download containing four PDFs and a read-me file in your chosen language. Read on screen or print on A4 paper; printing is optional. The investigation includes landscape graph pages. You will need a PDF reader, a ZIP extractor, paper and a pen.

€19.90. One-time purchase, no subscription. Digital delivery after payment; no physical product is shipped. This edition is a downloadable PDF game; interactive online play is not included. For personal and household use. Fictional investigation with AI-assisted illustrations.