“Soappy” is a hand sanitizer printer designed to encourage kids to foster the habit of washing hands regularly in a playful way. Like playing with a toy, kids can choose patterns of sanitizer they like on the screen of "Soappy" and get them printed on their hands. According to the level of how dirty their hands are, "Soappy" can provide different groups of patterns. When the hands are dirtier, the patterns in a group become more complex, which contain more hand sanitizer.