Socratic Puzzles

There Are Two Errors In The The Title Of This Book: A Sourcebook of Philosophical Puzzles, Problems, and Paradoxes

Amazing Math Puzzles

Mathematical Fun, Games and Puzzles

Tangrams : 330 Puzzles

Amazing Science, Facts, Feats, and Puzzles

More Bible puzzles and games (Spire books)

The World of Nature Invisibles: Hidden Picture Puzzles

Brainstorms: Real Puzzles for the Real Genius

Christmas Crackers 2: A Further Collection of Zany Jokes, Puzzles and Riddles