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Nightmare difficulty unlock corrected to level 25.
Much like in Diablo II, difficulties are unlocked by beating the previous difficulty. So to unlock nightmare, the player must have completed the quest [[The Prime Evil_(Quest)|The Prime Evil]] in normal. The same goes for Hell and Inferno.
However, there is a level restriction on difficulty levels. For Nightmare, the player must be level 3025. For Hell, the player must be 50. Level 60 is the minimum entrance for inferno.
If a player defeats a difficulty but is still behind the level requirement, the game will automatically place them at the beginning of the game in their current difficulty after defeating the final boss in Act IV. So if a player beats Hell mode, for instance, they will be brought back to the character screen at [[The Fallen Star]], still in Hell difficulty.