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- Braingle - User submitted and ranked brain teasers, riddles, logic problems and mind puzzles. Exercise the brain and boost learning and creativity. - ENGLISH
http://www.braingle.com
- Conceptis logic puzzles - Nonstop fun with the world's best logic puzzles: free online picture-forming logic puzzles. - ENGLISH
http://www.conceptispuzzles.com
- The Grey Labyrinth - A collection of puzzles, riddles, and paradoxes designed to stimulate lateral thinking. - ENGLISH
http://www.greylabyrinth.com
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