Spring Theme Binary Number 8x8 Grid Puzzles - 12 puzzles, No Prep
Binary Puzzle: 250 Easy to Medium Logic Puzzles 8x8 (Binary Collection): Mindful Puzzle Book: 9781098802592: Amazon.com: Books
Binary Puzzle Book for Adults: Binairo Logic Puzzles with 480 Easy to Hard Riddles in 6x6, 8x8 & 10x10 Grids (Binairo Puzzles): Books & Publishing, Flatline: 9798726681801: Amazon.com: Books