Overview
This is an easy guide to beating the Fast Upgrades special mission, this is just what I’ve come up with, and shouldn’t be too hard for anyone else to recreate.
What you need
You’re not going to need much, just access to tier 3 upgrades on a few towers.
1. Tier 3 on the right side of the Dart Monkey, and the Monkey Submarine.
2. Tier 3 on the left side of the Tack Shooter.
3. Tier 2 on the left side of the Ice Tower.
You won’t need any premiums or lab upgrades to my knowledge, the only one I used was tier 1 attack speed, which shouldn’t matter that much
What you do
This shouldn’t be too hard.
Round 1; put a dart monkey at the end of the track, and get it to 0/1, and put an ice tower on the bridge at the bottom of the track, halfway between the castle and the agents bar.
Round 2; Your dart monkey should be 0/2 and your ice tower should be 1/0 now. Upgrade the dart monkey to 0/3 and the ice tower to 2/0.
Round 3; You should have a Super Monkey Fan Club (which doesn’t really matter) and an Arctic Wind now. Place a tack shooter just above the Arctic Wind, and sell the dart monkey to get the tack shooter to 3/0 (Tack Sprayer). Next, get a monkey submarine somewhere, I don’t think it really matters where, and upgrade it to 0/1 when you can, preferably before the round ends.
Round 4; You should have a 4/0 Ice Tower, a 0/2 Monkey Sub, and a Ring of Fire now. Get your monkey submarine to 0/3 and use road spikes or whatever you want to stop the leaking bloons. Just spamming road spikes should work fine though, since the Arctic Wind & Ring of Fire should get most of the bloons.
Round 5; You should have a 0/4 monkey submarine now. Use the monkey submarine’s ability, and you win!