When you buy this book you get an electronic version (PDF file) of the interior of this book. Shikaku is a fun and addicting logic puzzle game. This book is ideal if you know how to play Shikaku no matter their size, but you find our hard Shikaku puzzles too difficult. You get the perfect mix of different sizes of Shikaku to keep you entertained for weeks. Once you pick up this book, you won't be able to put it back down. You have been warned! Shikaku Mixed Grids - Medium is a collection of 159 puzzles: 40 medium Shikaku 21x21 puzzles 40 medium Shikaku 26x26 puzzles 40 medium Shikaku 30x30 puzzles 39 extra logic puzzles The goal of Shikaku is to divide the grid into rectangular and square pieces such that each piece contains exactly one number, and that number represents the area of the rectangle. I guarantee that every logic puzzle in this Shikaku puzzle book has been carefully checked to ensure that each puzzle has only 1 solution. None of the puzzles in this book will appear in any of the other English PuzzleBooks.net books. Shikaku is also known as Divide by Squares, Divide by Box, Number Area.