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Brain Teasers
Fruit Game  http://www.2020tech.com/fruit/ 

Brain Bashers  http://www.brainbashers.com/

Brain Teasers  http://www.eduplace.com/math/brain/index.html

Math Teasers  http://nces.ed.gov/NCESKids/CRUNCH/challenge.asp

Sum of Squares  http://www.syvum.com/cgi/online/serve.cgi/contrib/teasers/sumsq1.tdf?0

Middle School Brain Twister  http://www.teachersfirst.com/twister/twister2a.html