- Mystery of Time and Space - interactive online adventure game featuring logic puzzles. From Logan Interactive.
- Puzzlenut.com - crosswords, education puzzles, daily brain teasers, and more.
- World Puzzle Federation: Team USA - includes information on the U.S. Puzzle Championship and history of the World Puzzle Championship, news, registration, and more.
- World Puzzle Federation - international organization that brings together puzzlers from around the world for the annual World Puzzle Championship.
- Puzzling Things - directory of sites about puzzles and games.
- Puzzles.com - puzzles, logic problems, illusions, tricks, articles, and more.
- Puzzle Depot - features online crosswords, riddles and word puzzles, logic puzzles, and puzzle software.
- curiouser.co.uk - offers paradoxical designs, puzzles, poems, and ideas.
- Association of Game and Puzzle Collectors (AGPC) - dedicated to the collecting and preservation of old games and puzzles, and to research on the history of games and puzzles.
- Archimedes' Laboratory - mechanical puzzles, optical illusions, mazes, tessellations, and paradoxical games.
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