DEDUCTIONARY THE BOOK

The Puzzle Book for Pure Reason.

DEDUCTIONARY is not just a puzzle—it is a test of clarity. In a world of random guessing, here, every letter earns its place through rigorous logic. You are given a 5x5 grid, cryptic icons, and a set of precise clues. Your goal? Deduce the only possible solution. No guessing. No tricks. Just pure, satisfying deduction..

• 50 Challenging Puzzles:
No warm-ups. No filler. Every single grid offers a rigorous mental workout from the very first page.
• Zero Guesswork:
Every puzzle has exactly one logical path. If you have to guess, you missed a clue.
• Large Format:
Clean, spacious grids designed for notes, scribbles, and moments of epiphany.