Some of the zombies are pretty strong. The player should upgrade their plants before playing the level.
Upgrade your plants' power by playing previous levels. Then strengthen them even more with Puzzle Pieces and the Oven in your house. Hunt more Puzzle Pieces from previous levels.
The stronger attacking plants should be used here. Ice plants such as Snow Pea can be used to freeze enemies. Use defensive plants, such as Wall-nut, to protect other plants. You can also use other players' plants for stronger attack power and defense.