6 books in series
World of Tiers
World of Tiers is a 6-book series with 6 primary works first released in 1965 with contributions by Philip José Farmer.
| #1 |  The Maker of Universes
| 3 | 2 reads | ||
| #2 |  The Gates of Creation
| 3.67 | 5 reads | ||
| #3 |  A Private Cosmos
| 3 | 1 read | ||
| #4 |  Behind the Walls of Terra
| 3.5 | 5 reads | ||
| #5 |  The Lavalite World
| 4 | 6 reads | ||
| #6 |  Red Orc's Rage
| 3 | 5 reads |