This is a digital download, hardcopy can be purchased at Lulu.com
A 'side quest' from the line of Tales of Gor adventures, The Game of Worlds is an excellent way to bring Earth-based characters to Gor and set them off on their adventures as an introduction. It starts on Earth and takes them to Gor, in the wake of being caught up in the intrigues on their own world, from there they can return - or stay - to live a life of adventure on a more colourful planet.
This booklet also contains non-canonical speculation, rules and ideas for Earth-based campaigns and characters, as well as the interplanetary cold war as it plays out on that world.
Ta Sardar Gor!