BrainBashers - Puzzles, games and optical illusions
Cut-the-knot - Interactive Mathematics Miscellany and Puzzles
Zuzzle.com - Puzzles, riddles, brainteasers, word games to test yourself
Nick's Mathematical Puzzles - With hints, solutions, and links to related mathematical topics
Timway Riddles Section - A collection of riddles and puzzles.
AHA! Puzzles - Lloyd King's Puzzle Books and Creative Brainteasers
Fundrum My Conundrum - Come think outside the box with all kind of puzzles
Braingle - Brain teasers, riddles, logic problems and mind puzzles
Mindbluff - Optical illusions, games, puzzles, brain teasers
UCSD Mathematics Club
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