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Strong Greenies made their first appearence was in Luigi's Mansion 2, they have 50 HP, and their main attack is the same as a normal Greenie, but Luigi takes more damage. They were infected by crystals in the Secret Mine, which made them more stronger as the name states.
At the ScareScraper they are quite common on a 5 floor ScareScraper mostly on floors 3-5.
The Mini-boss Strong Greenie with Chains in Secret Mine has 100 HP instead of 50 HP.