In normal, the player has to beat the zombies at level 1.
Difficulty
This level properly introduces the Double-Cabin Aircraft Zombie. Just like with many Sky City Zombies, it can screw you up if not taken care of. High DPS plants should be used to quickly destroy it. The player also has to worry with the Imps from the Transport Boat.
Strategies
Double-Cabin Aircraft Zombie can absorb a huge amount of damage. Use high DPS plants to take it out easily.
Bucketheads are also a pain as they can be meatshields for the Double-Cabin Aircraft Zombie. Use the newly unlocked Cycloque, as it can easily weaken it.
In hard mode, the player has to defeat leveled-up zombies.
Difficulty
Level 3-4 Double-Cabin Aircraft Zombies are now more dangerous than ever. Now that it has more health, upgrading your plants is a must for defeating it.
Strategies
Do as what you did in normal, but with leveled-up plants.
The small number next to the zombie icon means that zombie will always appear in that lane, with 1 being the topmost lane and 5 being the bottommost lane.
