520 books • 20 series
Field of Puzzles - Very Hard - Patchwork 9x9 + Kakurodoku 12x12 + Nurikabe 9x12 (Pitstop Puzzle Bonus, #39)
Quality Puzzles Sudoku - 250 Very Hard Levels + Bonus 250 Jigsaw Sudoku (Pitstop Puzzle Bonus, #37)
250 Logical Sudoku - Very Hard Levels + Bonus 250 Classic Samurai Sudoku Puzzles (Pitstop Puzzle Bonus, #36)
100 Labyrinth 50x50 + 100 Slaughtering Samurai + 50 Mega Hidoku 20x20 Very Hard (Pitstop Puzzle Bonus, #35)
Labyrinth 20 X 20 - 250 Logical Puzzles - Intriguing Sudoku (Pitstop Puzzle Bonus, #32)
Labyrinth 30 X 30 - 250 Logical Puzzles - First-Class Sudoku (Pitstop Puzzle Bonus, #33)
Luxe Sudoku - Jigsaw Killer Puzzles - "x" Diagonal - 250 Logical Rebus - (Pitstop Puzzle Bonus, #29)
World Sudoku - Jigsaw Puzzles Very Hard - 250 Logical Rebus (Pitstop Puzzle Bonus, #28)
Brickwalldoku - Cool Sudoku 2 - 250 Logical Puzzles - Large Print (Pitstop Puzzle Bonus, #27)
High-Quality Logical Puzzles - Samurai Sudoku - Large Print - (Pitstop Puzzle Bonus, #26)
Logical Amazing Puzzles - Classic Sudoku 16 X 16 - Large Print (Pitstop Puzzle Bonus, #25)
Large Print - 250 Jigsaw Sudoku - Anti-Diagonal - Amusing Puzzles (Pitstop Puzzle Bonus, #23)
Large Print - 250 Jigsaw Sudoku - X Diagonal - Deluxe Puzzles (Pitstop Puzzle Bonus, #22)
9 X 9 Anti-Diagonal - Best Classic Sudoku - Luxurious Puzzles (Pitstop Puzzle Bonus, #18)