A Napse is an enemy in Mario & Luigi: Bowser's Inside Story. It appears in the Energy Hold.

In Mario & Luigi: Bowser's Inside Story

Napses attack by creating two energy balls, one of them being red, and the other one being green. The balls will turn blue, and the Napse will throw the balls at the Bros. of their respective colors, and they have to jump over the balls. If the bros. don't defeat the it in time, the Napse will multiply into another Napse.