So Richard LeBlanc Jr has stripped everything down to a usable format for Labyrinth Lord or B/X and made it an easy access for DM who don't have the time to deal with the issues of conversion, reference, and all of the little details that make planar and dimensional travel a headache everything here is boiled down into an easy to use format. Basically this is planar travel without tears and its pretty nifty. The break down is easy to understand and there are some old favorites for magic items even. The planar travel isn't the nightmare its been in the past and the author explains everything out like stereo instructions step by step from set up to plug & play making this a very easy to understand book on the planes. There's a bit of everything laid out in easy understand and plain English. Its pretty much all there for the DM to pick, choose, and use as they see fit.
Everything is laid bare in this book from the basics of plane physics and its effects on magic, to thumbnail sketches of the planes themselves, a quick overview of magick on the planes, a smattering of magic items and diagrams outlining the planes, the ways magic effects them and your PC.
The nice thing about this book is the fact that there's no real emphasis on how to use this pdf, you could easily tack this onto a Mutant Future session as easily as a regular game of B/X Dungeons and Dragons or mix it up. The fact that its free makes this an even more enticing little gaming morsel. There is a ton that can be done with this little pdf, such as grafting onto other campaigns and getting much expanded other dimensional multiverse. The nice thing is the simplicity and functionality of the piece, it makes adventure crafting quite nice in a simple way when a DM doesn't have to reach for the Manual of The Planes. For a short seven pages of old school retroclone fun, this is a damn little useful book. Four out of five, I kinda wish there might have been a bit more of this book but it is free!