- 400 CalcuDoku MEDIUM puzzles 9 x 9 + BONUS 250 classic sudoku: Sudoku medium puzzles and classic Sudoku 9x9 very hard levels
- 400 KAKURO 13 x 13 + 14 x 14 + 15 x 15 + 16 x 16 best puzzles + BONUS + surprise: Holmes presents to your attention the excellent, proven sudoku. Format 8.5 '' x 11 ''
- 400 classic Killer sudoku 9 x 9 EASY - MEDIUM + BONUS 250 Hidoku puzzles: Sudoku with Easy, Medium levels puzzles and a Hidoku 9 x 9 very hard levels (Killer classic sudoku 9 x 9)
- Book Tridoku Sudoku. Hard Level.: 400+ Challenging Puzzles. Holmes Presents a Book for Productive Fitness to Your Brain. (Plus 250 Sudoku and 250 Puzzles That Can Be Printed).
- 400 CalcuDoku VERY HARD puzzles 9 x 9 + BONUS 250 classic sudoku: Sudoku very hard puzzles and classic Sudoku 9 x 9 very hard levels






























