1000+ Sudoku Puzzles for Adults: A Book With More Than 1000 Sudoku Puzzles from Easy to Hard for adults. Nova, Publishing XR
The Ultimate Logic Grid Puzzle Book for Adults, Volume 4 – Extreme Edition: 100 Fiendishly Fun and Creative Puzzles for Passionate Solvers (Logic Puzzles – The Ultimate Collection) Books, Unicorn
Relaxing Brain Games for Adults: 100+ Logic, Math, and Word Puzzles to Help You Unwind Callisto Publishing