its easy you keep backing up and shoot with your bow and make units as time goes by and use cards too
You have to buy her.
Kill all the zombies in each stage and beat the final boss
Below in the related links is a website that has a full video walkthrough of this level and how to beat it.
easy, just kill the zombies
you just have to survive 20 waves of zombies.
Beat the game
no!
Get 30
By planting plants and defeating the zombies. Best tactic is to hold zombies off with the walnuts.
Yes, they are hard to beat. But to do this, put a couple lily pads down after your defense (peashooters, snow peas, etc), and put wallnuts on them. The snorkling zombies will come up to eat the wallnuts, therefore giving your plants a chance to kill the zombie, and BAM! done.
To beat the game you must complete adventure mode for at least once
You have to beat adventure mode. Then you will get survival mode