The d100 list I never knew I needed: Sphynx/Puzzle Riddles. : r/DnD
D&D Forest and Jungle Puzzles: (with free puzzle)
Sea - Themed Puzzles for your adventures - Tribality
The Game Master's Book of Traps, Puzzles and Dungeons: A punishing collection of bone-crunching contraptions, brain-teasing riddles and ... RPG adventures (The Game Master Series): Ashworth, Jeff, Hilton, Kyle, Bhullar, Jasmine, Three
D&D 5E - Riddles and Puzzles in Gaming and Dungeons and Dragons in particular. | EN World Tabletop RPG News & Reviews
The Wizardly Waterfall D&D Puzzle — Dungeon Snacks
D&D Door Puzzles: A Designer's Guide (with free puzzles)
D&D Logic Puzzles: An Easy Step-by-Step Guide
Puzzle: The floor of runes | Online Dungeon Master