Place a Spike Factory at the very end of the track. Upgrade it to (Perma-Spike). Let it build up a pile for 10 rounds. Even if a B.A.D. bloon leaks past your main defense, the Permaspike pile kills it instantly. It is a safety net for careless players.

If you are reading this to immediately improve your win rate, apply these three tactics:

: Include three paths of upgrades for each monkey, similar to the BTD6 digital system

You cannot just spam damage. The game checks your intelligence by sending special bloons.