The World Puzzle Federation is an international association of puzzlers and puzzlers' groups. It hosts the World Puzzle Championship, an annual event since 1992.

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The Open Directory Project is the largest, most comprehensive human-edited directory of the Web. It is constructed and maintained by a vast, global community of volunteer editors.

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Puzzle projects by Peter Grabarchuk, including puzzle products, books and publications, web puzzles and other puzzle activities.

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From Tricky and Clever Puzzles through Baffling and Perplexing Illusions to Cognitive Toys.

Tags: logic, puzzle, cognitive, illusion, toy, game, crossword, brainteaser