Bloons Tower Defense 5 - Daily Challenge 24 March 2013 (Frugal Space)(NA...

Frugal Space - Beat Space Trunckin' on Hard to round 70 without space greedy towers. Stat at round 45. Two of each tower. By sniper 355

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