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Brainy toys for kids of all ages. Sorted by age group and various subject categories. They sell books, brainteasers, games, puzzles, and building sets. Great source for creative "extra time" activities.

Brain Boosters offers online activities for your kids including educational games and brain teasers. This website would be beneficial if you wanted to put one of these up on the board with your warm-up problems. You could also use some of these as bonus questions on a test or just a fun filler to pull out of your bag of tricks.

User submitted and ranked brain teasers, riddles, quizzes, trivia, logic problems and mind puzzles. Free online games and message boards.

Really Cool Math Websites! Algebra Sites! Geometry Sites! Even Discrete Math, Trigonometry and Calculus Sites! Math Puzzles and Math Brain Teasers Sites! Math Web Quest Sites! Math Humor! Elementary, Middle School, and High School Math Teacher Resources!

Fun riddles and brain teasers for students.