Previous research has shown that children with Attention Deficit Disorder (ADD) and Attention Deficit Hyperactivity Disorder (ADHD) have unique difficulties that can make more traditional methods of teaching less effective. In this paper, we present a novel approach for designing computer games aimed at offering a more dynamic way of teaching ADD/ADHD diagnosed children, keeping them engaged and increasing their learning outcomes. The process of applying our design principles to two open source games (Aquaria and SuperTux) and our future plans will also be described. Author