I got Diablo 3 recently and have played up to Act III. I was just invited to a game by my friend who is in Act IV. We beat a level in Act IV and now it seems it is unlocked for me to play and to progress further in.
I can see the drawbacks of skipping quests, since I will be underleveled. However, I have very good gear (Rare/Legendary) that I got for good deals on the AH and I am able to defeat them.
So, if I were to play through Act IV while skipping Act III, would the game move me on to the next difficulty? Or would I have to complete those quests I skipped in Act III?
Thanks for reading.