Tubba Blubba's Heart
From the Super Mario Wiki
Tubba Blubba's Heart is, as the name implies, Tubba Blubba's heart. Tubba Blubba becomes invincible when his heart is magically removed by Bowser. Hiding in the Windy Mill, the heart controls Tubba Blubba as if he is a puppet. However, Mario discovers Tubba Blubba's heart, and the two battle. It is the first half of Chapter 3's boss. It has 50 HP, 0 Defense, and a 6-Damage Attack that doubles when charged.
When Tubba Blubba's Heart HP reaches around 5 HP, he runs away from Mario and escapes the undergrounds of Windy Mill. When he reaches the surface, he sees Tubba Blubba outside and reunites with him. Tubba Blubba eats his Heart and becomes vulnerable with his heart inside his body.
Tubba Blubba's Heart is seen in the parade after the player beats the final boss, chasing his body when three Boos carry Tubba Blubba away.
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