Zombie Enemy: Regular Zombie, Conehead Zombie
Level Reward: Shovel
For this stage, you will have to start setting up sun production while getting the timing. Your goal is to setup your sunflower production team while putting up enough peashooters. To get through this stage easily, setup the 4~5 sunflowers before putting your peashooters.
Then you can kill every zombies quite easily with 2~3 rows of peashooters.