Due to six rows having minecarts, this means these columns can only have one defending or attacking plant at a time. With relatively quick waves with Chicken Wrangler Zombies and Gargantuars in the end, day 30 is no doubt quite tricky, especially with row 4 plants being especially vulnerable.
It is ideal to use strong attacking plants on the minecarts on the first three columns, (such as Pea Pod or Melon-pult/Winter Melon) while the last three columns are nearly useless since they can only defend three rows at maximum. It is also recommended to use Lightning Reed to handle the Chicken Wranglers and Primal Wall-nut to stop the Gargantuars. It is recommended to use your more powerful plants, especially high-level ones, as they may not be your favourite, but will help you pass the level.
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