Hidden Halls and Earth SheltersSize: 17Difficulty: easyObscure Architectural Styles of Underground CitiesPerfect for beginners with simple, common vocabulary
Subterranean Labyrinths: Enigmatic Designs of Buried CitiesSize: 20Difficulty: hardObscure Architectural Styles of Underground CitiesChallenging puzzle for experienced crossword solvers
Hidden Designs of Underground HavensSize: 17Difficulty: easyObscure Architectural Styles of Underground CitiesPerfect for beginners with simple, common vocabulary
Hidden Designs of Underground LivingSize: 8Difficulty: easyObscure Architectural Styles of Underground CitiesPerfect for beginners with simple, common vocabulary
Labyrinthine Vaults and Hypogeal DesignsSize: 5Difficulty: hardObscure Architectural Styles of Underground CitiesChallenging puzzle for experienced crossword solvers