Lot of (2) Dell Collector's Series Selected puzzles Sum-doku Volumes 28 & 29. Each book is a collection of *108* specially selected puzzles from the editors of Dell, only available directly from publisher. To solve Sum-doku enter numbers in the diagram so every row column and small square within the larger diagram contains numbers 1-9. Each puzzle contains areas surrounded by dotted lines. The numbers entered into each area must add up to the number in the corner and all digits in an area must be different from one another. Hours and hours of great puzzle fun! PLEASE NOTE: All of our puzzle books are near mint to mint or better, in condition. In a few cases there may be slight wear or creasing to the cover due to the cover softness. In no case will the contents of the book be affected. Thank you for your interest and please be sure to see our other listings for more great books and collectables.