I answered your question. You are talking about <img src="/ubbthreads/images/graemlins/beyond.gif" alt="" />, and that was the answer to your question.
I already completed <img src="/ubbthreads/images/graemlins/beyond.gif" alt="" /> (german version) and you get a house in Act3. There are 4 Acts, and after you completed one, you can't go back. It's pretty linear. Inside one Act it's not linear <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
