Rec Room, Luigi's Mansion Wiki

The Rec Room (Japanese: トレーニングルーム Training Room) is a room that can be found by Luigi in the third area of Luigi's Mansion. When Luigi enters the Rec Room, he sees the ghostly bodybuilder Biff Atlas working out. Luigi can ignore Biff or fight him for more treasure. Smacking Biff with a nearby punching bag, Luigi managed to goad him into attacking. Hitting Biff a few more times with nearby punching bags caused the overly muscled ghost to pass out and expose his heart, allowing Luigi to attack and

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Finally got to play the arcade version at Dave & Buster's 🙏🏽 : r/LuigisMansion