The 125 Best Brain Teasers of All Time: A Mind-Blowing Challenge of Math, Logic, and Wordplay Danesi, Marcel
Brain Games – To Go – 10-Minute Mystery Puzzles: Unsolved Crimes, Secret Codes, Whodunits, and More Brain Games, Publications International Ltd.
Logic Grid Puzzles, Volume 4: 50 Fiendishly Hard Puzzles (Logic Puzzles for Adults – Platinum Collection) Unicorn Books