Play free puzzles, riddles, brainteasers, lateral thinking problems, spot the difference pictures, advanced puzzles for geeks and brainiacs and more.
With over 20,000 brain teasers, riddles, logic problems, quizzes and mind puzzles submitted and ranked by users like you, Braingle has the largest collection anywhere on the Internet.
Visit SeriousPuzzles.com for brain teasers and puzzles of all kinds including thousands of jigsaw puzzles by nearly every major manufacturer in the world.
A web part of a puzzle-book-web project entitled Age of Puzzles. The project makes a comprehensive mosaic of puzzles created by different people in different time and at different places.
Leonid Mochalov of puzzlemochalovlp.com is a Russian puzzle creator and author. Amongst his creations are puzzles such as Pyramid and Chess Cube as well as new types of riddles such as SQUAREWORDS, LABYRINTH-NUMBER and EXPRESS-LABYRINTH.
A collection of mind-blowing Brain Teasers, quiz questions and psychometric tests, all designed to stretch your wits to the limit and beyond from this prolific author of puzzle books, IQ Tests and trivia quizzes.
A large collection of logic puzzles, math puzzles, puzzling riddles and other brain teasers
Puzzles, Brain teasers, unique wooden puzzle toys.
Algebra, geometry, matchstick and logic puzzles, paradoxes, optical illusions, IQ tests and logic games.
Thinks.com has the unique distinction of consistently being recognized as a top Education site as well as being a top Entertainment site. This reflects its commitment to the educational value of games and puzzles for all ages.
Original free puzzles from this witty Daily Telegraph (UK) brain teaser columnist and puzzle book author. Delightful cartoon illustrations, entertaining recreational mathematics articles and more.
Kevin 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.
From Tricky and Clever Puzzles through Baffling and Perplexing Illusions to Cognitive Toys.