A Napse is an enemy in Mario & Luigi: Bowser's Inside Story. It appears in the Energy Hold. Napses take their design from a neuron, having a central pink body and a network of web-like tentacles that resemble dendrites radiating from their body and a pair of eyes on their "front." Napses attack by creating two energy balls, one of them being red, and the other one being green. The balls will turn blue after their respective Napse reaches its peak height as it spins upward prior to attacking.