Welcome to the BloonsGuide.com walkthrough for today's (December 12th, 2023) Bloons TD 6 Advanced Challenge: "Lead" by Victornhbbuh!
In this short guide, you'll learn how to beat the Advanced Challenge, and you'll better understand why this strategy works.
Let's get started.
The Solution
The Tower we're going to use to solve this challenge is the Dart Monkey.

Throws a single dart at nearby bloons. Short range and low pierce but cheap.

$215
The Challenge
To start the challenge, place a Dart Monkey at the very top right of the map behind the umbrella and upgrade it to 2 / 5 / 0:
Then, as soon as the Plasma Monkey Fan Club ability comes off cooldown, use it as the Lead Bloons are about to exit the map. This will transform your Dart Monkey into a Super Monkey that shoots Plasma Blasts, which are actually able to pop Lead Bloons:
"Attacks 1.5x faster and pops Lead Bloons. Cannot pop Purples."
And that's it!
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Thanks for reading, and happy popping.