(also known as " " from Japanese " "; literally " "; " ", " ", or " ") is a type of logic puzzle. It is played on a rectangular grid with no standard size, although the grid itself is not usually drawn. Some cells start out with (usually encircled) numbers from 1 to 8 inclusive; these are the islands. The rest of the cells are empty.The goal is to connect all of the islands into a single connected group by drawing a series of bridges between the islands. The bridges must follow certain criteria: - They must begin and end at distinct islands, travelling a straightline in between.- They must not cross any other bridges or islands.- They may only run orthogonally.- At most two bridges connect a pair of islands.- The number of bridges connected to each island must match thenumber on that island. The puzzle book contain: - 200 Puzzles - Handy 6 x 9 inch Book Layout - 2 Puzzles per Page - Ideal for both Beginners and Experts In the book you will find a description and examples of solutions for all puzzles. The book is for those who like logic and math problems. Decide, developing and improving.