New Air Units
Air units are now supported across the entire map.
Added a new air unit: Littel Bird Helicopter (crafted at the Vehicle manufacturing plant; unlocked via its own tech).
Added a new air-unit building: Airship Factory (unlocked via its own tech).
Added a new air unit: Zeppelin Airship(crafted at the Airship Factory).
New Challenge Mode: Defend Fangfang Pearl Tower
This map continuously spawns ranged Snowman Zombies that attack the Square Pearl Tower.
Fangfang Pearl Tower: consumes electricity and deals powerful, large-area lightning damage.
New Zombie Units
Balloon Zombie
Witch Broom Zombie
Cannon Zombie
These three types appear in Endless Mode: Zombie Survival Diary 6 –The Dangerous Ivory House and Challenge Mode: The Ivory Defense.
Balloon Zombies appear starting on Day 7.
Witch Broom Zombies appear starting on Day 17.
Cannon Zombies spawn in the starting map.
New Level-Up System for the Main Characters:Leveling up grants stronger effects.
Uncle George: gains increased damage per level.
Tom: gains reduced attack interval per level.