Has anyone found a satisfying (read: you've played it at least once and liked it) way to tweak the difficulty up without adding more than, say, half an hour to the base game or ramping up the complexity and housekeeping?
I would love for the change to meet most of these conditions:
- Add no new mechanic or a very simple one
- Add more decision making rather than more chance
- Add no more than half an hour to the game
- Tweak the win rate down to somewhere between 50% and 80%
That said, if you have something you love, post it regardless.