Welcome to the BloonsGuide.com walkthrough for today's (November 30th, 2023) Bloons TD 6 Advanced Challenge: "Sometimes It's Bad if a Tower Does Damage" by Grandma22!
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 main Tower we're going to use to solve this challenge is the Druid - although we're going to use more than one!
Finally, a challenge without a Wizard Monkey.

Creates a blast of thorns for each attack. Upgrades can call forth powers of the Jungle, Storm, or Wrath.

$340
To easily handle today's Advanced Challenge, place a Druid in the spot you see in the screenshot below and upgrade it to 0 / 5 / 0, or Spirit of the Forest. Furthermore, place a Sniper Monkey on the right side of the map for coverage and upgrade it to 2 / 0 / 5, or Elite Defender in the bottom path and Large Calibre in the top path.
The Druid's Spirit of the Forest vines will begin to grow around every corner of the path, making it extremely difficult for Ceramics and other Bloons to make progress on the map when paired with a Sniper Monkey chipping them down.
Moreover, the Elite Defender Sniper Monkey should do large damage to final MOAB that appears, popping it before the end of the track. The resulting Bloons will be melted by your vines and Sniper Monkey.
That should be enough to beat the challenge!
Why does this work?
Spirit of the Forest is a great ability for dealing with Ceramics.
Spirit of the Forest
Take a look at the ability description:
"Grows thorned vines along the path that deal constant damage plus bonus damage to ceramics. Vines nearest the Spirit of the Forest do more damage. Activated ability generates lives and more cash."
Elite Defender
SOTF isn't the best, however, with popping MOABs. It hardly does any damage to them in this challenge. That's why we've also placed an Elite Defender who can shred the MOAB when it appears.
The Map
Finally, given the long, windy nature of the map, Spirit of the Forest's use case is further strengthened. The vines should grow to reach nearly the entire map a few rounds in - this gives them plenty of time to pop the Ceramics and resulting Bloons.
If Regrow Bloons appear from the Ceramics, the Sniper Monkey's "Large Calibre" combined with the ultra-fast shooting from Elite Defender should help to shred them before they can regrow at all.
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Thanks for reading, and happy popping.