Bloons super monkey 2 final boss

Heavy Metal Bloon health stages

The Heavy Metal Bloon (also known as Robotic Lead Monstrosity or Underground Boss) is the final boss of Bloons Super Monkey 2 that appears in Mount Magma. It is a giant rocket-propelled metal blimp shaped like a Lead Bloon. Not only is this boss extremely difficult to pop/destroy, but it also defends itself by creating weapons and barriers out of Shielded and Phasing Bloons.


  • Despite looking like a Lead Bloon, the Heavy Metal Bloon can be damaged by darts, boomerangs and their upgrades.
  • It has what looks like an extremely electrically charged Shielded Bloon, that seems to be powering/controlling the boss.


Main article: Heavy Metal Bloon/Strategies

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