Welcome to the BloonsGuide.com walkthrough for today's (December 18th, 2023) Bloons TD 6 Advanced Challenge, "When You Use the Wrong Tower V2" by EliteImmortalz!
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 Glue Gunner.

Shoots a blob of sticky glue that slows Bloons down by 50%

$245
The Challenge
To start this challenge, place a Glue Gunner at the top left-hand side of the map and upgrade it to 3 / 0 / 0, or Bloon Dissolver:
The Glue Gunner should hit the MOAB as it comes out of the gate. The MOAB will die just before leaking, and the Ceramics that spawn afterwards will leak - but you'll be left at 1 HP since you started with 417!
And that's it.
Why This Works
This challenge is very similar to Dec. 15th's challenge in that we only need to pop the MOAB to win the challenge.
Popping the MOAB is difficult, however, since we do not have any global range towers to place. Any regular towers we place will not have enough time to pop the MOAB. This is where Glue Gunner comes into play.
Corrosive Glue allows the Glue Gunner to target MOABs. Bloon Dissolver also increases the corrosion damage and pierce of Corrosive Glue, allowing us to deal more damage to the MOAB.
Since the MOAB's health is reduced this challenge, this gives us just enough time for the Corrosive Glue to pop the MOAB, winning the challenge.
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Thanks for reading, and happy popping.