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IQ Tests

General:

• high quality MENSA IQ test
• mind sports worldwide - short (10 questions)
• hard - IQ more than 130
• world's quickest free IQ test
• free IQ test

Extremely difficult:

• great Griffioen IQ test
• Paul Cooijman
• uncommonly difficult IQ tests - links
• The Hoeflin Power Test
• The Ultra Test
• The Titan Test
• The Smartest Person in the World Contest
• Laurent Dubois