RTanque is a game where players program the brain of a tank using Ruby code and then compete in battles against other tanks that are otherwise equal. Players develop their tank's brain to handle radar detection, movement commands, and responding to other tanks detected in its area. To participate, players clone the RTanque GitHub repository, install dependencies, build and test their tank code locally, upload it to a Gist, then post the Gist link in the #RTRT channel on the RubyMY Slack to battle other tanks.