Well, Div: partly had no acts, but used a system like proposed by Proverbius : The more and farther you travel away from "home", the more difficult the enemies get ...
Objection your honour. <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
Divine Divinity:
Act I _ Aleroth.
Act II _ Everything else up to the sacrificing ritual.
Act III _ The waste lands.
<img src="/ubbthreads/images/graemlins/wave.gif" alt="" />
