is played on a rectangular or square grid with black and white cells. All black cells contain numbers. The aim is to draw a horizontal or a vertical line in each white cell. Each number represents the total number of white cells occupied by the lines from that number. Lines cannot enter other numbered black cells or intersect with other lines. 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.