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Jellopuses are enemies from Wario Land: Shake It! Their name is a portmanteau of "jellyfish" and "octopus", both of which they bear resemblance to. They only appear in underwater levels with the Subwarine. They appear in cyan, yellow, and purple variations. They move in a wavy pattern.
Blue Jellopuses just swim around in a carefree manner and pose no threat. Yellow Jellopuses swim in a wavy pattern and can be sort of a nuisance. Purple Jellopuses, on the other hand, discharge electricity. When Wario is close enough, the Jellopus will discharge four balls of electrical energy which will damage Wario if he is hit by one.