I was very amused by Tepper's successful creation of a world based, apparently, on a Dungeons and Dragons-esque version of chess. The characters are (mostly) all pieces in the Game (from Pawns to Kings) and they are playing for life or death. The world of The True Game, you see, is entirely based on the Game. Its political and social structure, its economics and religion, are all dependent on what happens in the Game. As we learn through Peter, how you live your life and what Talents are discovered in you at adolescence, determines what sort of rank or type of piece you are in the Game. Of course, no-one wants to be a sacrificial Pawn!
The True Game collects the first three books in the True Game series (King's Blood Four, Necromancer's Nine, Wizard's Eleven). There are nine books in this series, grouped together in three different trilogies. The other two trilogies concern the boy's mother, Mavin Manyshaped (The Song of Mavin Manyshaped, The Flight of Mavin Manyshaped, The Search for Mavin Manyshaped) and his wife, Jinian (Jinian Footseer, Dervish Daughter, Jinian Star-Eye). I understand that the trilogies are not ordered chronologically (the middle trilogy happens first). I suspect, rather like with the Chronicles of Narnia, you could read them in either in the order set by the author or chronologically without your brain exploding!