158 books • 21 series
250 Medium to Hard CalcuDoku Puzzles 9x9 (Calcudoku, #7)
250 Hard to Very Hard Straights Puzzles 9x9 (Straights, #9)
250 Hard to Very Hard Calcudoku Puzzles 9x9 (Calcudoku, #9)
250 Easiest Calcudoku Puzzles 9x9 (Calcudoku, #1)
250 Very Easy to Easy Calcudoku Puzzles 9x9 (Calcudoku, #8)
250 Hard Calcudoku Puzzles 9x9 (Calcudoku, #4)
250 Tetroid Puzzles 9x10 (Tetroid, #5)
Pokemon Word Search Puzzle (Pokemon Puzzle Book, #1)
250 Easy Calcudoku Puzzles 9x9 (Calcudoku, #2)
250 Medium Calcudoku Puzzles 9x9 (Calcudoku, #3)
250 Tetroid Puzzles 10x10 (Tetroid, #3)
250 Very Hard Straights Puzzles 9x9 (Straights, #5)
250 Easy to Medium Straights Puzzles 9x9 (Straights, #6)
250 Tetroid Puzzles 8x8 (Tetroid, #1)
250 Medium Straights Puzzles 9x9 (Straights, #3)
250 Tetroid Puzzles 9x9 (Tetroid, #2)
250 Easiest Classic Sudoku Puzzles 9x9 (Classic Sudoku, #1)
250 Hard Classic Sudoku Puzzles 9x9 (Classic Sudoku, #4)
250 Tetroid Puzzles 8x9 (Tetroid, #4)
250 Easy Straights Puzzles 9x9 (Straights, #2)
250 Hard Straights Puzzles 9x9 (Straights, #4)
250 Easiest Straights Puzzles 9x9 (Straights, #1)
250 Medium Classic Sudoku Puzzles 9x9 (Classic Sudoku, #3)
The 2018 Calcudoku 9x9 Puzzle-A-Day Calendar Book (Puzzle-A-Day, #10)