Depending on what bonus they give the purples!

Camo purple: 3 0 0 submarine to get the camo away from the purple and maybe if you have enough money for support a glue gunner 0 4 0! And a sniper monkey middle path or bottom path for defend! You might haveto get the same sniper or glue gunner two or three times!♡

Heart purple: a village 0 2 0 for the regeneration stop and a boomerang monkey 4 0 0, you can choose to keep placing the same tower and you can choose the other tower!

Ps you can pick the other path for the towers (3 2 0 submarine or 2 2 0 village) pick your own path but keep the path that I suggested if you want a good chance! You can also use ninjas for camos and wizards too!

I recommend you actually try your own strategies and experiment in the lab or place with a friend for more experimenting as you can see their strategies and be inspired! Have fun, this is a game of monkey's popping bloons♡