“Enjoyable and doable! Easy Sudoku”
contains 75 easy sudoku problems for beginners.

“Sudoku Communication Vol.47”
is a biannual Sudoku magazine with over 100 puzzles ranging from easy to hard. It also has a few puzzles other than Sudoku and articles related to Sudoku.

“Otegaru Suiri Puzzle (Logic Puzzle)”
This volume contains over 50 Logic Puzzles from “Sudoku & Logic Puzzles for Home” Vol.1 to 4.

“Puzzle the Giants Best Selection 5”
contains carefully selected giant-size puzzles from “Puzzle the Giants” Vol.23-26. You can enjoy over 30 types of puzzles, about 120 in total. Please note that some of the puzzles are in Japanese.

“Sudoku & Logic Puzzles for Home Vol.8”
contains about 80 puzzles, mainly Sudoku and Logic Puzzle.

“ChoGekikara (Really really hard) Sudoku 15”
contains 91 sudoku puzzles.

“Puzzle Communication Nikoli Vol.187”
is the most advanced pencil puzzle magazine in Japan. The first issue was published in August, 1980.

“Nankan(Hard)Sudoku 15”
contains 105 sudoku puzzles.

“Just Right! Sudoku (a bit hard) 4”
contains 105 Sudoku puzzles, most of which are of medium difficulty.

“Crossword puzzles with various themes”
Crosswords on various themes. You need Japanese to do them.