I have also taken advanced AI courses in DrRacket. "Racket is a full-spectrum programming language. it goes beyond lisp and scheme with dialects that support objects, types, laziness, and more. Racket enables programmers to link components written in different dialects, and it empowers programmers to create new, project-specific dialects. Racket's libraries support applications from web servers and databases to guis and charts."
Many of those challenges have come from books such as htdp (How To Design Programs). This book gives section by section analysis on each section of the DrRacket language.
I am currently working on a 3D First Person Shooter. I have made platformer games in the past that got positive reviews. I am really working on modeling, texturing and mostly on level design.