User blog comment:Monkeysandbox/Daily Challenge 99 is impossible/@comment-141.0.9.76-20120504031845/@comment-141.0.9.76-20120504125232

Because the monkey village does not attack, the M.I.B. doesn't attack either this is availible because it's weponless. So if you purchase it, all towers will know how to crack every single bloon.

High energy beacon is availible also.