Difficulty

is a recurring mechanic in .
==Overview==
======
There are four levels in : Easy, Normal, Hard, and , with only being unlocked after beating all . In the original , only the base-game eighteen needed to be beaten, but in and , all thirty-two must be completed. Higher levels will make deal more damage and have more health, but will also increase the amount of gained upon completion of a . may only be applied to a , and not battles.In each , there is a that may only be found while playing on Hard or .
======
In , the modes Easy, Normal, Hard, or Very Hard may be chosen for any or . As part of the Downloadable Content pack, an Apocalyptic mode was added. The level alters how much damage do, as well as how much damage it takes to deplete their , but it does not effect the number of gained, nor any other rewards.
==Nomenclature==