PDF Version (Quick disclaimer: I am the author of some other OneDice material and a big fan of the system since its inception)
Updated and revised, the OneDice Universal ruleset goes from strength to strength. The original was good but it just got better with additional rules and ideas between the covers. Love the new look cover too.
The page count now stands at over 80 pages with the rules for Mooks & Minions plus Sanity in there too. The layout has also improved making it even easier to read through. Additionally, the book also includes a multiplayer fantasy adventure plus a solo play (Pick a Path style) Sci Fi one.
Great for any age group and the rules actually encourage roleplay rather than just rolling dice. A good system for teaching rp as well as for more experienced gamers.