The Pencil Puzzles 20xx series are the renewal versions of our best sellers "Penpa 20xx" series. The book contains about 260 number puzzles, includes English explanation. The names and numbers of puzzles included are below. Suraromu 27 Akari 28 Double Choco 24 Numberlink 27 Yajilin 32 Heyawake 31 Slitherlink 32 Kakuro 20