Bloons Tower Defense 5 - Daily Challenge 23 March 2013 (Blind Guessing)(...

You will need Dartling Ammo Dump tier 3 for this to work.

Blind Guessing - with 3/3 Tack Shooters, 1/4 Boomers, 4/3 Dartlings, and 2/3 Farms beat Downstream on Medium rounds 12-53 with 3,214 starting cash. Slight RBE chage.by Ninjabase

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(Please comment if you have better strategy)
For more walkthrough: http://bloons-tower-defense-5.blogspot.com