Easy 10x10 Binario Puzzle Book: Binary Puzzles to Keep Your Brain Young ( Puzzle Books for Adults Variety Sudoku and Mathdoku): Fun, Learn &: 9798789319048: Amazon.com: Books
2021 Binary Puzzle: 365 Easy to Hard Puzzles for Every Day of the Year : Keep Your Brain Young (Game Calendars Series): Alzamili, Dr. Khalid: 9798695435030: Amazon.com: Books