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Dynamic Difficulty

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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 numbers of levels that the player has lost or won. In total, there are six types of difficulties regulated by this system. The following types are from the easiest to the hardest: SE, E, N, A, H, and T. The values that differ are the number of Plant Food given, along with the number of zombies or zombie types in the level. It should be noted that some levels may not have a drastic change in difficulty, whereas other levels will become exceedingly easy or difficult after reaching the respective extremes of difficulty.

The victory/loss counter follows a simple system. If the player loses or resets in a level eight times, it will be in the easiest difficulty the next time they attempt a level. However, if the player wins in any level eight times in a row, even after the loss streak, the next level will now be in the hardest difficulty. The victory/loss counter will not exceed eight, so if the player wants to lower or increase the difficulty, they should win or lose eight times. The following table shows each difficulty type and the number of levels the player would need to win or lose in order to be at their respected difficulty type.

Difficulty Plant Food Number of zombies Requirements (levels won) Requirements (levels lost)
SE α Plant Food given 20% fewer zombies None Eight
E α Plant Food given 10% fewer zombies One Seven
N α Plant Food given Normal number of zombies Two Six
A α minus one Plant Food given 16% more zombies Five Five
H α minus two Plant Food given 30% more zombies Seven Three
T α minus three Plant Food given 40% more zombies Eight None

There are several levels with fixed difficulties. These levels are: