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I got 13. And that was after a couple of tries. I almost made perfect play on that one, in that I only wasted about 3 cone zombies. I guess the trick is to keep restarting game until you get an easy first round, do it with minimum expenses trying to save as much money as you can cuz your bank carry over each games. I absolutely love levels with the mushroom that ducks down. That's like free money. All you gotta do is get bucket zombie on every row at the same time.
8 here. Tryed for the achievement, but a map full of Squash, Spud Mines and Chompers, and 6 strategically placed Starfruits, with a Magnet next to an Umbrella Plant in the center to boot really screwed me over. I managed to beat it, but only had 25 solar power left...
Got a streak of 11 on my 4th try and that's with making a few mistakes along the way. I think I can do better if I play it again but I don't find it enjoyable enough to do so. I guess it's because it's too repetitive: get rid of umbrella if next to magnet, get rid of magnet, use digger zombies.