Lethal Goobs are a rare variety of Goobs appearing in ScareScraper mode in Luigi's Mansion 3, added in version 1.3.0. They are red and black, glowing Goobs that instantly KO the player in one hit. They have 250 HP, more than double that of a regular Goob. They are defeated the same way as normal Goobs.
Lethal Oozers, a rare variety of Oozers, Lethal Hammers, a rare variety of Hammers, and Lethal Slinkers, a rare variety of Slinkers were also added in version 1.3.0.
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