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 by Jeff Ashworth | 9781948174985
D&D Door Puzzles: A Designer's Guide (with free puzzles)
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Dungeons & Dragons classroom program adds new puzzles and mazes kit - Xfire
101 Traps, Puzzles, and Twists for "D&D" and RPG Campaigns - HobbyLark
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