- For the level before the v1.8 update, see Sky City - Day 4 (Pre-1.8).
The zombies are the same as the previous two levels, so do the same as you would from Sky City - Day 2. In addition, the player has received the cannon of the ship, which will aid them in defeating zombies.
The zombies can be level 4, which can be troubling without a level 4 plant. It's suggested to level up some plants before trying to take on this level on hard mode. The cannon of the ship will not do as much damage as before, due to the zombies having elevated health, so keep that in mind.