How can I change the difficulty?

In order to change the difficulty level back to normal, you have to go to your Character selection screen, select the quest/act and then use the drop down menu in the bottom left hand corner to change the difficulty (re: screenshot).

1. Go to your character select screen
2. Select Change Quest
3. Near the bottom you can change difficulty.

NOTE: Each difficulty has to be unlocked first!

Normal - available by default

Nightmare - Beat all 4 acts and be at least level 30

Hell - Beat all 4 acts on Nightmare and be at least level 50

Inferno - Beat all 4 acts on Hell and be at least level 60

Select "Change Quest" from the Character Menu. At the bottom left of the menu you can change the difficulty.