$4.48 The Original Area Mazes: 100 Addictive Puzzles to Solve with Simple Math—and Clever Logic! By Naoki Inaba, Ryoichi Murakami and Alex Bellos
$4.48 The Original Area Mazes, Volume 2: 100 More Addictive Puzzles to Solve with Simple Math—and Clever Logic! By Naoki Inaba and Ryoichi Murakami