Board Thread:Questions and Answers/@comment-6944850-20140611222958/@comment-3153244-20140612081350

Generally, you try to minimise money spent on your defence, and maximise money spent on Farms, while also maintaining a reasonable defence. Once you have accumulated enough Farms and money, sell most of your farms for a 4/2 BRF. I find that the most efficient way to farm is by accumulating one 3/0 and lots of 2/0 Farms, before selling the 2/0 Farms for a 4/0 &rarr; 4/2 BRF.

Once you have the BRF, it will help you earn a lot of money quickly, although this only applies in the earlier rounds. After Round 90, Farms become less efficient and should be replaced with LOTS of 0/4 Sniper Monkeys.