[dlweinreb]

Take a look at InspireData (http://www.inspiration.com/InspireData). It is entirely written in Common Lisp (http://www.lispworks.com/success-stories/inspiredata.html). The creators of InspireData used Lisp for its high productivity and ease of development.It uses native menus, drop-downs, and so on, and is uses OpenGL. The customers never know it's written in Lisp. There is no problem at all with garbage collection (i.e. no pauses that anyone ever notices).

It's pretty obvious that since you can do this, a game like PacMan can also be done. I don't see any obstacle to writing 3D games. Common Lisp has been used for a huge range of kinds of application.

If you're looking for a languages with no side-effects in the same sense as in Haskell, the Clojure dialect of Lisp is well worth looking at.