Camp Bloons. A real challenge if you don't have the right towers. Most monkeys can pop them, any Ninja Monkey, a 1/2+ Dart Monkey, 1/3+ Monkey Engineer. But Boomerang Throwers? I don't think so. Unless you're super rich, camp detection for the Boomerang Thrower is nearly out of question. It takes an 8000 $ upgrade, right after buying the actual thrower, Multi-Target ($270 (for hard)), Glaive Thrower ($300), and Glaive Ricochet ($1,620). That's stupid! Plus, if you choose this path you miss the $1,730 Bionic Boomer, which is much better (and leads to the special Super Charge ability). I hope this gets notice from Ninja Kiwi to change this configuration. Let's fight for Boomerang Thrower rights (LOL)!