25 epistemic logic and deduction puzzles
Hats, statements, strategies and information: 25 challenges with hidden, explained solutions.
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Logic
50 logic games that trick the mind
Fifty questions built on ambiguity, mental shortcuts and lapses of attention. Answer first, then reveal the result and explanation.
ReadSix Kordemsky puzzles: mathematics almost without calculation
Shoes, apples, trees, target shooting, a purchase and logs: six problems where the right reasoning matters more than lengthy calculations.
ReadThe pigeonhole principle: theory, method and 25 worked problems
From the box principle to remainders, geometry and subsequences: 25 problems with solutions to reveal after trying.
Read25 games: sometimes lying, sometimes telling the truth
Alternating liars, limited truths, particular days and conditional behaviors. Each game is followed immediately by its solution and explanation.
Read25 paradoxical logic puzzles
Question, immediate solution and explanation. All examples are formulated coherently.
Read15 problems about brothers and sisters
Solutions with and without equations, with explicit construction of the pairs
ReadBefore calculating: recognize the family of a problem
Ten strategies for recognizing the structure of problems: guided examples, a simulated lesson and three exercises with hidden solutions.
ReadLateral thinking: 25 puzzles that challenge your assumptions
Reworked classics and new situations: 25 puzzles with hidden hints and explanations, separating facts, assumptions and possible answers.
Read20 logic puzzles: liars, jobs and paradoxes
Twenty puzzles with hidden solutions: truth-tellers and liars, six four-person job matchings, and six paradoxes to discuss.
ReadA curious situation involving ages
An algebraic logic problem about age gaps among three siblings: why can the situation occur only when the gaps are consecutive numbers?
Read50 challenging problems: equations, logic, and lateral thinking
Fifty advanced problems to tackle with equations, direct reasoning, or lateral thinking, with solutions hidden at first.
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