Lateral 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.
ReadMathematics
Articles by topic
Clear, organized learning paths that build strong foundations in mathematics and computer science.
Logic
20 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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