This book contains over 100 puzzles. (New Puzzles) The first volumes in this series came out in Feb, 2020. With the "Pencil PuzzleLibrary" series, you can enjoy Nurikabe and Shikaku and Heyawake and Numberlink and this Yajilin. Yajilin page in WEB Nikoli https://www.nikoli.co.jp/en/puzzles/yajilin.html