2 books • 2 series
Book #1: 160 CODE WORD Puzzles, Vol.2
Book #3: 160 CODE WORD Puzzles, Vol.3
Book #2: My First SuDoKu Book 2
Book #3: My First SuDoKu Book. 3
Book #4: My First SuDoKu Book, 4
Book #5: My First SuDoKu Book, 5