Okay, so you're finally going to play Diablo 3.
Every time I play Heroes of the Storm, I immediately regret how terrible I am at it.
So you've been persuaded to try Diablo 3 (maybe you read about the basics). You've loaded into the game, and now you're faced with the question of what game mode to play. There are many modes of play in Diablo 3 and some of the modes refer to what content you're playing rather than what difficulty.