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> **Possible Duplicate:**  
> 
> [How can I change the difficulty?](https://gaming.stackexchange.com/questions/67346/how-can-i-change-the-difficulty) 
> 
> 
> 

I played through as a Monk, unlocked Nightmare, went back and played with friends on Normal mode but now want to get back to Nightmare mode. How do I do this? Thanks.