If you enjoy Math logic puzzles, then you will love Kakuro Puzzles Kakuro - or Cross Sums puzzles - are math logic puzzles that are similar to a crossword puzzle. The puzzle square contains filled squares and empty squares and clue squares. It is your job to fill in the empty squares with a number between 1 and 9 to solve the equation presented. This puzzle book:Is 8.5 X 11 inches allowing for lots of space to work on the puzzle Has 160 puzzles to challenge everyone from young to old Is a perfect birthday gift, Christmas gift or stocking stuffer Challenge your brain today!