Board Thread:General Discussion/@comment-1313357-20140107163927/@comment-4795804-20140110095239

Bomb Tower upgraded to 3/2 or 4/2 is good to destroy large masses of bloons. However, you also need some tower that can reduce zebra/black bloons. I like Ninja 4/2 for this purpose, but they can be ineffective when the number of bloons is too large, so then you can also use Mortars upgraded al least to X/2 (good to combine with Ice Towers at least on 2/2) or you can use Glue Gunners 2/2 (or 2/3 for much better results).

In later rounds, if I have enough money, Mortars 4/2 are my favorite choice.