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Biff can be found working out in the mansion's Rec Room, which can be reached after defeating Bogmire. To reveal Biff's heart, Luigi must smack a punching bag into Biff three times. When Biff gets hit, he becomes angry, and swings his fists wildly at Luigi, costing Luigi twenty life points if hit (1/5 of his total life), and forty life points in the hidden mansion. After the third punching bag attack, Biff will lie on the ground, dazed, with his heart revealed, leaving him vulnerable to be sucked up by the Poltergust 3000. Should Biff break free of the vacuum during the ensuing struggle, he will need to be smacked with the punching bag again.
Biff is one of the few portrait ghosts to be optional and not necessary to capture to progress in the game, the others being Jarvis, Mr. Luggs, Slim Bankshot and Sue Pea.
The player will need to be careful when approaching Biff, because damage can be received should Biff drop his weights on top of Luigi.
A bust of Biff Atlas can be seen in the mansion's Artist Studio.
Likewise, A portrait of Biff holding a trophy can be seen hanging in the Rec Room.