Bloons TD 5
90 Achievements
100,000 XP
Isn't That Special
Complete the Special Agent Only Special Mission
1,000 XP
1.07%
How to unlock the Isn't That Special achievement in Bloons TD 5 - Definitive Guide
Tips: place plenty of bushes towards the exits. These will save you big time in the last waves. Also, use the super monkey whenever you get in trouble
Another quick tip is that if you're having trouble with MM (Monkey Money) then I recommend the No Escape mission as a way of farming MM. No Escape is easy, quick, and provides 400 MM each time you beat it. I also have a guide posted on the No Escape solution page showing you how to farm it effectively.
With all of that being said, this mission is really easy if you're willing to just tower spam and use super monkey storms whenever you need them. You're going to need to get all of your agents to pro anyways, so tower spamming will help with that too.
The most relaxing and foolproof way to tackle this mission without using dozens of agents is with six Bloonsday Devices in my opinion. Make sure to place them at the back so they the shortest way to reach the most advanced bloons. You should enable Auto-Start Rounds and play on normal speed, then each 14 seconds activate the ability and once you've done that six times for all devices you can play on fast forward and just activate the ability each time it becomes available again. This way you should constantly have one Bloonsday Device active. You might also add more devices to make this even easier. It might be wise to backup your save file before you attempt this mission so you won't waste any agents on failed attempts.
This is a demonstration of how to win this mission without any Monkey Lab upgrades: