15 Dungeon Puzzle Rooms + PDF 5e Supplement : r/FoundryVTT
Sea - Themed Puzzles for your adventures - Tribality
Puzzle: The floor of runes | Online Dungeon Master
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 (The Game Master Series) (Hardcover)