215 books • 12 series
Numbricks For Kids 150 Very Easy to Easy Numbricks 6x6 (Numbricks Puzzle Books for Kids, #14)
Numbricks For Kids 150 Very Easy to Easy Numbricks 4x4 (Numbricks Puzzle Books for Kids, #4)
Numbricks For Kids 150 Easy to Medium Numbricks 8x8 (Numbricks Puzzle Books for Kids, #25)
Numbricks For Kids 150 Easy to Medium Numbricks 6x6 (Numbricks Puzzle Books for Kids, #15)