Brain Teasers

A Gadzillion Things To Think About
Thousands of humourous questions to encourage creative thought in all age groups.
Brain Teasers Central
Brain teasers, cool optical illusions, riddles and other cool stuff!
Brain Teasers For Kids
Dozens of printable brainteasers for children. Includes word games, riddles, and math puzzlers.
Brainden - Brain Teasers
A site full of brain teasers.
Braingle - Brain Teasers & Riddles
Tangles the brain with user submitted and user ranked brain teasers, mind puzzles and riddles.
Curiouser.co.uk
Home of the Paradoxical. Features a selection of paradoxical puzzles, tricks, illusions, games, poems, quotations and more. 9 out of 10 respondents say curiouser.co.uk is the curiousest.
Eduplace - Brain Teasers
Brainteasers for kids and adults.