101 Traps, Puzzles, and Twists for "D&D" and RPG Campaigns - HobbyLark
Puzzle Dungeon -
The Game Master's Book of Traps, Puzzles and Dungeons: A punishing collection of bone-crunching contraptions, brain-teasing riddles and stamina-testing encounter locations for 5th edition RPG adventures: Ashworth, Jeff, Bhullar, Jasmine, Three Black