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				A forum and collection of brain teasers, logic problems, math problems, paradoxes, science games, probability, riddles, and geometric shapes. The puzzles are ...			 
				
					http://perplexus.info/				
							 
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					Offers both current and archived crossword puzzles.				 
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					Printable brain teasers for kids and adults, riddles, logic puzzles, paradoxes, optical illusions, IQ tests, free brain games, lawyer jokes and other challenges for ...				 
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					User submitted and ranked brain teasers, riddles, quizzes, trivia, logic ... Braingle.com. Sign In Create a free account. Username: Password: Forgot? Remember me ...				 
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					Brain Boosters offers online activities for your kids including educational games and brain teasers. ... Win a Wireless Lab. Siemens We Can Change the World ...				 
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					L'indovinello più difficile del mondo (The hardest logic puzzle in the world) is ... Retrieved from "http://en.wikipedia.org/wiki/The_Hardest_Logic_Puzzle_Ever" ...				 
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					Challenging puzzles and games including jigsaw puzzles, crosswords, word searches, and trivia.				 
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					Interactive mathematics miscellany and puzzles.				 
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					Family game of visual perception.				 
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