Bloons TD 3 Map 7

I think, out of all the maps, the spiral is the easiest. That being said, do not be stingy with tacks/pineapples. I was saving for a Boost Tower, and didn't lay tacks until it was too late. For reference, letting a MOAB slip costs you 445 lives =O, and even a Ceramic spells instant game over on any difficulty except easy.