Under rating threshold (hideshow)
There should be an Impossible badge called "H4x", which you earn by getting every single medal (Easy, Medium, Hard and Revers) for all maps, including the extremes.
Under rating threshold (hideshow)
the robo-monkey is better at popping the moab class bloons, and the sun god is quicker at popping small bloons. I think, since most other towers are better at popping small bloons (especially ice w/shards) the robo is a better choice. It is also less expensive.