Air Raid 3

Air Raid 3 is a difficult level focused on Balloon Zombies.

Overview
This minigame has 3 huge waves of zombies, and can be rather annoying given the fact that the only zombies between huge waves are Balloon Zombies. Also, this level is not a conveyor-belt level, but you can't choose your plants either. Instead, three plants are pre-chosen for you. These three are the Lily Pad, the Sunflower and the Cactus.

Every Flag

 * Flag Zombie
 * Zombie
 * Ducky Tube Zombie

Common

 * Balloon Zombie

Strategy
This level gives you 40 seconds to prepare, so during this time, plant two rows of Sunflowers. LEAVE THE BACK ROW EMPTY! This is where you need to plant your Cacti. At the beginning, the Balloon Zombies will come one or two at a time, so just plant Cacti in the rows where Balloon Zombies come and continue to harvest sun. About halfway towards the second flag, Balloon Zombies will come more and more at a time, so at this point you'll want to put 1 or 2 (maybe even three) rows of Cacti in front of the Sunflowers.

Trivia

 * This allows only one shooting plant, the Cactus.