Indicia · Volume 1
Eighty cases. One pencil. Zero luck.
A thief hides among the guests of a 1920s party. Every suspect leaves a single statement, and you have to place them all on the grid to work out who did it. No guessing: there is always a logical path to the answer.
The contents
What's inside
Eighty cases ordered from easiest to hardest, so the curve carries you from the first page to the last.
From 6×6 to 16×16
The first cases take a few minutes. The last ones are sixteen-suspect boards that can take you a whole afternoon.
Three kinds of theft
The jewel in a room, the owner who lands on the last free square, and the thief who had an accomplice. The mechanic shifts, so the book never turns repetitive.
Always a unique solution
Every case went through a solver that verifies exactly one solution exists. If there were two, the case never made it into the book.
Solutions and glossary
Every answer is at the back, with the solved board, plus a glossary explaining each keyword used in the clues.
The rules
How to solve
The rules fit in half a page and never change. Everything else is deduction.
01
One person per row and column
Place someone and their whole row and column are blocked for everyone else.
02
One statement per suspect
Their card says something true about where they were. Reading it properly is half the work.
03
"Beside" means orthogonal
Above, below, left or right — and inside the same room.
04
The one left over is the thief
Once everyone is placed, only one person can still be in the jewel's room.
The method
How it was made
The book wasn't assembled by hand. Every case comes from the same engine that produces the game's cases: it lays out the rooms, the furniture and the suspects, writes the clues, and then tries to solve the board with a solver that reasons by techniques, the way a person would.
If the solver finds two solutions, the case is discarded. If it has to guess at any step, discarded too. Only boards that resolve through pure deduction with exactly one answer survive — and out of those, the book keeps eighty, ordered by the real difficulty the solver measured.
That same engine produces the step-by-step chain of reasoning the app uses when you ask for a hint. That's why the book and the game feel alike: they're the same brain.
Specifications
The two editions
Same content, same eighty cases. Pick the language you'd rather read the clues in.
Spanish edition
El Libro de Casos · Volume 1
- Language
- Spanish
- Format
- Paperback
- Pages
- 186
- ISBN
- 9798188577070
English edition
The Casebook · Volume 1
- Language
- English
- Format
- Paperback
- Pages
- 186
- ISBN
- 9798188587321
Available on Amazon in the United States, United Kingdom, Germany, France, Spain, Italy, the Netherlands, Poland, Sweden, Belgium, Ireland, Japan, Canada and Australia. The button takes you to your country's store.
Prefer a screen?
The game has over fourteen hundred cases, a new case every day, and hints that walk you through the reasoning step by step. It's free.
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