Eclectic Technology

Refraction is "an online puzzle game for teaching fractions." To be successful you will need a knowledge of fractions. Spaceships with a variety of animals are stuck in space. To rescue them you work with lasers, bending them and using fraction concepts: "equal partitioning, addition, multiplication, mixed numbers, improper fractions, and common denominators." 
The game is free and runs in the browser (it does require Adobe Flash Player). For more information head over to the website. 

"Math teachers know that fractions can be hard for the average third-grader. Teachers at a public school in San Bruno, Calif., just south of San Francisco, are trying something new. They’re teaching difficult math concepts through music, and they’re getting remarkable results..."