The Pharaoh Zombie is unbelievably tough. Along with the already-dangerous Camel Zombies, they could destroy the player's plants easily.
Zombies now deal harder damage, so the player must make sure to keep an eye on their plants.
Upgrade your plants' level by replaying previous levels. Then upgrade them more with Puzzle Pieces and the Oven in your house.
Drag as many plants as you can into the lawn. Use other users' plants to have even more power. Note that you should place the plant with the strongest attack in the middle lane and a plant with the highest health of the rest in front of it to protect it.