Available on Amazon in Spanish
RASTROS
100 cases. One path. Reconstruct the trail and discover the culprit.
- 100 independent cases
- Five levels: easy to expert
- Gradual hints and complete solutions
Adults · Coming soon
The Impossible Version
Three people describe the same event. Only one account contradicts the facts the reader can verify.
- 50 independent cases
- Four difficulty levels
- Reasoned solutions
- Paperback edition
Adults · Coming soon
Faces: Who Does Not Exist?
One hundred and fifty identities. Forty cases. One of them does not exist, and every detail can change the deduction.
- 40 independent cases
- Identity and observation
- Visual deduction
Ages 8–12 · In preparation
The Impossible Version Kids
A collection of visual and narrative mysteries with progressive difficulty, where every answer must be defended with logic.
- 30 cases in four levels
- Independent or shared reading
- Illustrated square format
Adults · Coming soon
The Eight Minutes
At 11 p.m. someone will die. You have eight minutes, incomplete information and decisions that could change what is about to happen.
- Interactive thriller
- Decisions and consequences
- Narrative countdown
Ages 4–6 · In development
My First Book of Mysteries
Illustrated scenes invite you to hear three simple accounts and find which one contradicts the picture.
- 24 illustrated mysteries
- Shared reading
- Observation and spoken language
How to choose between these titles
The six books in the catalogue share a structure — closed cases with a provable solution — but ask different things of the reader. The useful difference when choosing is the kind of thinking each one calls for.
Reconstruct a route. RASTROS gives you a grid and a set of rules, and asks you to find the only path that satisfies all of them. Solve it with a pencil, marking and crossing out. It is closest to a formal logic puzzle: one hundred cases across five levels.
Find the contradiction. The Impossible Version and its Kids edition present several accounts of the same event and ask which one does not hold. They are solved by reading, not annotating, and work especially well aloud because they invite discussion.
Observe. Faces and My First Book of Mysteries base their deduction on visual clues: identities to compare in one, illustrated scenes that contradict what someone says in the other. They depend least on reading fluency.
Decide under pressure. The Eight Minutes is an interactive thriller: information is deliberately incomplete and decisions change the outcome. It is closer to a branching narrative than a book of cases.
The guides develop this comparison in more detail, including one on the difference between riddles, deduction puzzles and logic cases and another on choosing by age.
What is available today
RASTROS is now available on Amazon in Spanish as a paperback. The books are published in Spanish, and English editions are in preparation. The rest of the catalogue is in preparation or development, and the status of each title appears on the first line of its page. Check the price and purchase options for RASTROS on Amazon.
You can already use these free resources: nineteen RASTROS cases playable in the browser, with graded hints and solutions, and two downloadable booklets with ten cases each.