A. Ardson
BLACK BELT SUDOKU Volume 1 : Black Belt Sudoku
EXTREME SUDOKU Volume 3 : Extreme Sudoku
KILLER SUDOKU Volume 1 : Killer Sudoku
SUDOKU DIFFICULT Volume 1 : Difficult Sudoku
SUDOKU DIFFICULT Volume 2 : Difficult Sudoku
SUDOKU EASY and SUDOKU MEDIUM Volume 1
SUDOKU EASY PUZZLES Volume 1
SUDOKU EASY PUZZLES Volume 2
SUDOKU EASY PUZZLES Volume 3
Sudoku Easy Puzzles Volume 4
SUDOKU EASY Volume 5 : Sudoku Easy
SUDOKU EVIL Volume 1 : Sudoku Evil