For a bit more detail on the world-building game, it basically breaks down into three phases:
- as a group create a pantheon of the gods of Mars (each player will take on the role of a god);
- create a number of interconnected cities in a region of Barsoom of your choosing that your group will eventually adventure in; and then
- as a group, chronicle the history of the region, from the beginning of Barsoom, working forward to the 'present day' cities that you created, shaping the geography and history of Mars as its gods
Just to clarify, the Warlord of Mars RPG will still be published, but preceded by the world-building game, hopefully as a way of generating interest sufficient to fund the artwork for the RPG.