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12 Logic Puzzles That Will Test Your Smarts - Reader's Digest
25 Logic Puzzles (with Answers) for Adults - Parade
27 Hard Riddles to Test Your Smarts with Answers - Reader's Digest
50 Lateral-Thinking Puzzles (with Answers) to Challenge Yourself
101 Brain Teasers for Adults (with Answers) - Parade
Logic Puzzles - Aha! Puzzles
Brain Teasers and Puzzles - Student Handouts
20 Hard Riddles for Adults: Best Brain Teasers for Adults
30 Thought-Provoking Math Puzzles for Middle Schoolers
118 Clever Riddles for High School Students (Plus Answers)