PENDRAGON Book 7: The Quillian Games

The whole series are about Travelers and their leader is Bobby Pendragon. This is the only Pendragon book I read though. Travelers are people who travel from territory to territory( territories are like worlds) through flumes. Bobby goes to Quillian and finds out it's all about games there. If u lose you die. That's how a traveler died there. Bob competed in the games, won, than went back to 2nd Earth.