The world's 200 hardest brain teasers
Subtitle: mind-boggling puzzles, problems, and curious questions to sharpen your brain
By: by Gary R. Gruber.
Publisher: Sourcebooks, Inc.
Published: 2010
Place of publication: Naperville, Ill
Language: eng
ISBN-13: 9781402238574
Subjects: Logic puzzles; Lateral thinking puzzles; Word games