Bloons Tower Defense 5 - Daily Challenge May 23, 2013 (Face My Army)(NAPS)

Face My Army - With 2/3 Dart Monkeys, 3/0 Tack Shooters, 2/3 Bombs, 1/2 Apprentices and 2/1 Dartlings beat Castle rounds 20-50. By coolmasterlaser8

Video is on 2.5x speed
NAPS = No Agent, Premium and Speciality
(Please comment if you have better strategy)
For more walkthrough: http://bloons-tower-defense-5.blogspot.com