Ardent Offense was distributed as an HTML and a PDF file, copyrighted but made freely available. The game is set in a post-apocalyptic world where the laws and governance have broken down and individual power centers vie for control of resources. The rules are minimal and utilize a percentile system of skills modified by difficulty as a target against which percentile dice are rolled.
The core rules consist of a basic system of attributes, inferred skills, and opposed action resolution. Most of the documentation is given over to the philosophy of design and general concepts in roleplaying games.