Infact the best upgrade (PERSONALLY FROM MY VIEW) Is Pheniox and the boat.
The fire nothing can get past cheap and effective, as well as tornado blowers.
Truly the best way to get to this game tactic, is to raise up, then buy a monkey tower when you have lets say a lot, buy them keep buying them and you will make about 16000 per round with em, make sure you put them far behind though, I made about 500000 doing this!
Truly the best way to get to this game tactic, is to raise up, then buy a monkey tower when you have lets say a lot, buy them keep buying them and you will make about 16000 per round with em, make sure you put them far behind though, I
 "Critter Forge"){kind=icon}
 "Cookie Hamster"){kind=icon}
 "Cargo Bridge 2"){kind=icon}
 "Bloons TD 5"){kind=icon}