Subterranean Enigmas and Forgotten LabyrinthsSize: 20Difficulty: hardUrban Legends of Underground CitiesChallenging puzzle for experienced crossword solvers
Mysteries Beneath Ancient Underground CitiesSize: 9Difficulty: mediumUrban Legends of Underground CitiesModerate difficulty suitable for most players
Mysteries Beneath Hidden CitiesSize: 14Difficulty: easyUrban Legends of Underground CitiesPerfect for beginners with simple, common vocabulary
Secrets of Hidden Underground CitiesSize: 20Difficulty: easyUrban Legends of Underground CitiesPerfect for beginners with simple, common vocabulary