Bloons Tower Defense 5 - Daily Challenge 19 March 2013 (Sea of Horror)(NAPS)

For round 46, you will need to get at least 1 Spiked Mines to beat the BFB. :)

Sea of Horror - With limited tower selection, and stronger bloons, beat Archipelago rounds 20-70. Use the agents provided to start out strong. By Joey and Crushbeast

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