Adapt existing video games for our educational platform

Hi we are working on an educational video game system for students. We're looking to have popular video games adapted to our platform. We don't have a large budget, so instead of having video games written from scratch, we're hoping we can find people who have already written games and can re-skin them and modify them to fit our platform. We can use arcade games, racing games, adventure games, etc. The games must be able to run on a desktop, be OS indendent (HTML5?), and be non-violent . And of course you need to be able to legally sell a modified copy of the game to us. You will then have to integrate the game into our platform by creating a window where multiple-choice questions will be asked, and using our API to receive questions/answers and send us statistics. It's actually a pretty straightforward process. Let us know what games you have access to, and we'll help determine how the games can be adapted to our needs.