The Pharaoh Zombie is unbelievably tough, the player needs to kill it quickly.
Upgrade your plants' level by playing 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 plants with the strongest attack in the middle lane, in order to kill Pharaoh Zombie.