Is there a way to change the difficulty back to normal after you've started a game on nightmare?
- Go to your character select screen
- Select Change Quest
- 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