Think Clear This is a math trick posing as a 7-Up commercial (or vice versa, but it's subtle) and it's a good one! An interactive flash cartoon. When they tell you to enter something, you don't need a cursor. It works without one.

Logic Questions • Cyberchase • Woodlands Junior School in Kent (extensive game page which includes Rush Hour)
Brainboosters •

Chess • Math sites and games • Online Games