• NIEHS Kids Page Brainteasers, Puzzles & Riddles --
  
  NIEHS Kids Brainteasers, Puzzles, and Riddles, presented by the National Institute of Environmental Health Sciences as a means of introducing kids to science and research interests.
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• Thinks.com
  Games, Puzzles, Pastimes and Family Leisure
  Family-friendly recreations for all ages: games, puzzles, trivia, wordplay, and much more
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