World Of Ultraviolet Grasslands is a conversion kit for running Ultraviolet Grasslands on the engine of World Of Dungeons.
It's five pages, with good, readable layout and a scattering of illustrations, although you will want to have copies of both World Of Dungeons and UVG to use it.
That said, World Of UG is very well written and easy to use. Its conversions are clearly explained and feel comprehensive, and the book is very friendly to being hacked and adjusted to fit an individual group's taste.
Overall, If you like World Of Dungeons' system and want to run a game of Ultraviolet Grasslands with it, this feels like an excellent place to start.