The only difficulty here are the zombies with a slightly higher health than normal.
Enemies
Mummy Zombie x3
★
Health: 2970
Fighting Power: 349
First Strike: --
Special:
Attack: Deals damage to target.
Skill: The zombie uses his bandage whirlwind to attack, posing a threat to enemies in front of him.
Leader Skill: [Primary militantness high]
Strategy
Follow the tutorial, drag the plants you need into the lawn and you should win without any troubles.