Welcome to the BloonsGuide.com walkthrough for today's (December 8th, 2023) Bloons TD 6 Advanced Challenge: "Ultra Bad" by SuperJombombo!
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 Monkey Buccaneer.

Shoots a single, heavy dart from both sides of the ship. Must be placed in water.

$500
But that's not all! We're also going to make use of the Glue Gunner for some extra MOAB slows.
To start the challenge, place a Monkey Buccaneer to the very left of the water in the top left-hand corner of the map and upgrade it to 0 / 5 / 2, or Pirate Lord in the middle path and Crow's Nest in the bottom path.
Then, place a Glue Gunner in the bottom left-hand corner of the second loop in the map as you see in the screenshot and upgrade it to 0 / 0 / 3, or MOAB Glue.
Popping the BAD & DDTs
Your Pirate Lord should be able to do some damange to the BAD at the start of the round, but not much. The real damage starts when the BAD enters the loop where the Buccaneer is placed.
The BAD should die shortly before it completes the Buccaneer's loop. Immediately use your Pirate Lord ability when the BAD dies to kill the DDTs that spawn.
Popping the ZOMGs
This should leave us with 2 ZOMG MOABs left. By placing the Monkey Buccaneer at the very left of the top pool, we're ensuring that it doesn't have enough time to kill the resulting ZOMG MOABs. This is what we want.
From here on, just spam your Pirate Lord ability to take down the ZOMG MOABs one by one.
The MOAB Glue from the Glue Gunner should slow the ZOMGs as they come near the Glue Gunner giving your Pirate Lord ability time to come off cooldown. This should buy you enough time to use it twice, taking down both the ZOMGs!
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Thanks for reading, and happy popping.