90 books
Sudoku Hard Book 23
Sudoku Medium Book 20
Sudoku Easy Book 4
Sudoku Hard Book 25
Sudoku Easy Book 15
Sudoku Hard Book 14
Sudoku Hard Book 12
Sudoku Easy Book 9
Sudoku Hard Book 4
Sudoku Easy Book 24
Sudoku Medium Book 27
Sudoku Hard Book 22
Sudoku Hard Book 3
Sudoku Hard Book 7
Sudoku Hard Book 2
Sudoku Medium Book 19
Sudoku Medium Book 25
Sudoku Hard Book 24
Sudoku Hard Book 27
Sudoku Hard Book 13
Sudoku Hard Book 16
Sudoku Hard Book 28
Sudoku Hard Book 5
Sudoku Easy Book 25