Educational Game - Kids

[vyas]

Hello,
I am looking for Math (or any other subjects) Educational Game websites for children grade 2-4 that I can use in classroom situation to test with some 20 children at an elementary school. This is part of my research study.
Any help/advise would be highly appreciated.
Thank you
Vyas

[silverfish]

Here's one for reading:

http://www.explodethecode.com/02_how/student_demo/app/main/choose_skill.cfm?u=1-3-1