Project Aon's latest release isn't a Lone Wolf solo gamebook; this time around, it's the start of a comprehensive compendium of all of the rules used in the series and its spin-offs. Although the Rules Handbook is not yet complete, it contains enough information to help answer any questions that arise while you play the books currently available online, and it should also serve as a good introduction to the rules if you've never seen them before. Hopefully, it will continue to grow as the rest of the site's collection does.