Welcome to the BloonsGuide.com walkthrough for today's (December 4th, 2023) Bloons TD 6 Advanced Challenge: "M.O.A.B 800% PV / Only Tier 3" by DariusAurius!
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 Heli Pilot.

Hovers wherever you direct it. Shoots from twin heavy dart guns.

$1,730
To start the challenge, place a Heli Pilot near the start of the map as you see in the screenshot and upgrade it to 2 / 0 / 3, or Pursuit in the top path and MOAB Shove in the bottom path.
The Heli Pilot's "MOAB Shove" should have no issue repeatedly pushing the MOAB back on the track despite its speed, and Pursuit + Quad Darts should slowly but surely take the MOAB and resulting Bloons down!
Are there other solutions?
Did you know that the Heli Pilot's "Bigger Jets" upgrade in the middle path actually improves the knockback of MOAB Shove?
"Bigger Jets effect: Heli Pilot moves +75% faster. With MOAB Shove, improves MOAB Shove effect."
While not totally necessary for this challenge, it's possible that, with proper manual micromanagement of the Heli Pilot, MOAB Shove combined with Bigger Jets could prevent the MOAB of this challenge from making much progress at all.
Note: we gave this a try on mobile, and micromanaging the Heli is pretty difficult with such a fast-moving MOAB. Pursuit definitely makes the challenge much easier. Feel free to give it a try to see if you can do it yourself!
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Thanks for reading, and happy popping.