500 sun is not a lot to set a proper defense. However, the toughest zombie to beat is a Conehead Cowboy, so it should not be that hard to set a defense to win.
Level 2 zombies can be very difficult to defeat without leveled up plants and 500 sun. A good strategy is to use 4 Asparaguses. The game will level it up to 3 for free (as long as you get stars), so once they're leveled up, this level can be passed easily.
Gosh, I can grow leaves!
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