The most comprehensive and easy to navigate link directory for anything related to other puzzles and brain activities - games, toys, crosswords, quizzes, trivia, IQ, math and much more.
The World Puzzle Federation is an international association of puzzlers and puzzlers' groups. It hosts the World Puzzle Championship, an annual event since 1992.
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.
Puzzle projects by Peter Grabarchuk, including puzzle products, books and publications, web puzzles and other puzzle activities.
From Tricky and Clever Puzzles through Baffling and Perplexing Illusions to Cognitive Toys.