Archimedes' LaboratoryHypnotic site for active minds and puzzle enthusiasts: enjoy making and solving intriguing puzzles, discovering new optical illusions and more.
Brain TeasersAlgebra, geometry, matchstick and logic puzzles, paradoxes, optical illusions, IQ tests and logic games.
BrainBashersKevin Stone's unique collection of brain teasers, games and optical illusions. With over 1,200 teasers, 102 awards and around 1,400,000 Visitors per year, this site claims to be the world's most popular brain teaser resource.
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