365 Very Hard Jigsaw Killer Sudoku Puzzles For Adults: Fun And Challenging Nonomino Sumdoku Puzzle Games To Solve Daily, Perfect For Expert And Experienced Sudoku Players. (Vol- J. Very Hard 1)
The Do-It-Yourself Escape Room Book: A Practical Guide to Writing Your Own Clues, Designing Puzzles, and Creating Your Own Challenges (English Edition)
Memory Games for Seniors: A Large Print XXL Puzzle Activity Book with 501 Exciting and Funny Brain Exercises to Increase Cognitive Abilities [The Smart Senior Adult's Gift]