Math games that are non-traditional. Covers topics for 3-8th grades. From Univ of NM. Must see!
Multiple levels here as well. Creative way to work through the thinking process.
This site has multiple levels and really gets the kids (and me) thinking.
Get a free teacher account, set up your class, print out the student codes. The students don't even think they are working. Use it as a reward! Be sure to assign what you want the kids to work on. Check out the free reports for each student. Good for grades 1-9!
Stick with the games in the middle of the page. Avoid the ads on the sides. The logic section is very good. Stretch your brain!