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If you think "Tangram" and "Rubik's Cube" are too easy, it's the time for you to take up the challenges in the "Brain Teasers". Interesting puzzles, which encourage you to think creatively and develop your interest in mathematics, include the exhibits "Sum is Fifteen" and "Disorder", which test your numerical ability, "Balancing Nails", which trains the problem solving skills, and "Crossing the River", which helps develop your logical thinking. Hints are provided for reference.
"Brain Teasers" is produced by the Oregon Museum of Science and Industry, USA.
Sum is Fifteen