Lead Bloon

The  is a unique Bloon that was introduced in BTD2. Lead Bloons have also been featured in every subsequent BTD game. Having a unique ability, Lead Bloons are immune to sharp projectiles and the Super Monkey's Laser Vision, since they're made of metal. Identifying Lead Bloons is effortless as they have a metal-like appearance and they are the only gray colored Bloons in the game. Popping a Lead Bloon and its descendants rewards a total of 19 or 23 Money.

Children
Black bloon x2

Speed
This bloon moves as slow as a red bloon and a M.O.A.B in Bloons Tower Defense 4. However, despite the fact that it's slow, it's still faster than a B.F.B, since the BFB is slower than a red bloon.

Trivia

 * Due to Lead Bloons being introduced in BTD2 and appearing in every subsequent game, players can no longer pass the game with only Road Spikes or Dart Monkeys. However, this is theoretically possible in BTD4 given that the player has the Explosive Darts premium upgrade.
 * The Super Monkey's Laser Vision upgrade cannot pop lead bloons even though they're not sharp.
 * The TV show Mythbusters created a real lead balloon, and dispite common assumption, it's biggest problem was not it's weight. The lead was so fragile that it tore during inflation. They also built aluminum balloons, which apart from being an odd shape, worked perfectly well.
 * It is the only known metal bloon.


 * It is the only bloon to resist physical attacks not by using hit points. It takes one non-physical hit to pop.
 * It is unaffected by Tornado Attacks, since they're too heavy.
 * It is ironic that bombs can pop leads but not it's children, black bloons.
 * In the iOS version, Super Monkey Laser Vision can pop lead bloons.