Dynamic Difficulty

Dynamic Difficulty is a hidden gameplay mechanic in Plants vs. Zombies 2 and its Chinese version where the difficulty of a level will either increase or decrease depending on the actions done by the player. In total, there are six types of difficulties regulated by this system, and they are, from easiest to the hardest: Super Easy, Easy, Normal, Nothing, Hard, and Torch. The values that differ are the number of Plant Food given, along with the number of zombies in the level.

There are a number of levels which do cannot increase or decrease or difficulty. These levels are usually tutorial levels and Brain Busters except Special Delivery.