The Tomb Raiser Zombies and Pharaoh Zombies are really tough, so the player needs to upgrade 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 onto the lawn. Use other users' plants to have even more power. It is recommended to have all plants being powerful in terms of attack power, and high-health plants should be placed at the back.