Puzzle fanatics who can’t get enough sudoku and crosswords have turned to kakuro to sate their thirst for a more challenging puzzle. Kakuro is a close cousin of sudoku because of its similar rules, but the black-and-white grid lends it a crosswordlike appearance. Solving a kakuro puzzle also involves not only logic but math, so it's perfect for flexing your left-brain muscles. If you enjoy losing yourself in a kakuro puzzle, show us what you know about the game in our quiz.