Elite Agent

 is an achievement in Bloons TD 4 iOS. To get it the player must beat a track without losing any lives. To unlock this easily the player can just play on an easy track on Easy Difficulty.

Strategies:

Using a spike factory at the end to prevent any bloons from getting past, you can easily use MOAB maulers for MOAB popping power and a variety of other towers for maximizing bloon popping power.