"The Yellow Book of Brain Teasers: Word Puzzles" by James Wyburn is a delig...More

"The Blue Book of Brain Teasers: Word Puzzles" by Philip J. Carter offers a...More

"The Red Book of Brain Teasers: Maths Puzzles" by James Wyburn is a collect...More

"The Purple Book of Brain Teasers: Math Puzzles" by Ken Russell is a captiv...More