Website: iCivics
URL:  http://www.icivics.org/ 
Cost: FREE Rating by Jules~ 4 Star

Difficulty Level: Rated for 7th-12th Grade

Device:  PC

I learned about this site from a 9th Grade High School Social Studies teacher.  He said the kids absolutely love playing the games on the site.  Kids can openly (without having to login) play fun games that involve Civics.  The site offers 19+ games that are easy to follow, fun and interactive.  I looked into the site further and signed up as a teacher.  I tried to download some resources but was unsuccessful.  At this point, I believe this is a great site for supplemental integration of ideas that you might be covering in class.  I don't see that the teacher side is fully accessible and easy to use.