348 books • 21 series
Book #1: Numbricks Puzzles Book - 200 Normal Puzzles 9x9 (Volume 1)
Book #2: Numbricks Puzzles Book - 200 Normal Puzzles 9x9 (Volume 2)
Book #3: Numbricks Puzzles Book - 200 Normal Puzzles 9x9 (Volume 3)
Book #4: Numbricks Puzzles Book - 200 Normal Puzzles 9x9 (Volume 4)
Book #5: Numbricks Puzzles Book - 200 Normal Puzzles 9x9 (Volume 5)