Applications that do not use any of Common Lisp's more dynamic features (creating classes at runtime, evaluating arbitrary code) can usually be delivered all the way up to the maximum level of 5 without breaking. Our Othello game is one such application.
Try re-delivering the Othello game at different levels. Do this by editing your delivery script, changing the third argument to deliver to a number between 0 and 5 inclusive.
LispWorks Delivery User Guide - 13 Dec 2011