World of Tiers Books in Order

World of Tiers is one of Farmer's purest adventure engines. The basic idea is simple and huge at once: powerful beings called Lords create pocket universes, stacked or shaped to match their whims, then fight, scheme, and hide inside them.

The series begins with Robert Wolff, an ordinary older man on Earth who blows a strange horn and walks into another reality. There he becomes entangled with Jadawin, ancient rivalries, and most importantly Kickaha, the trickster-athlete who gives the books much of their speed. If Wolff is the doorway, Kickaha is the pulse.

Setting matters a lot here. Each world feels built rather than naturally grown, which means the land itself is often part of the trap. One book gives you towering levels and impossible stairways. Another gives you a planet that only pretends to be Earth. The Lavalite World turns unstable terrain into the main hazard.

The long arc is about power, identity, and who gets to play god, but the tone is much lighter on its feet than that summary sounds. These are swashbuckling books. People run, climb, bluff, escape, and get thrown into new trouble before they have processed the old trouble.

Later volumes widen the frame with Red Orc and questions about therapy, imagination, and the pull these worlds have on modern minds. Even then, the core appeal stays the same: clever heroes, dangerous Lords, and a multiverse designed for motion.