- Non-elective mode.
- When you level, always switch to the latest runes or abilities that you gain.
It's interesting because you are forced to use every rune as they come up. You'll use runes and abilities that you would never touch normally. You'll lose abilities and runes that you consider staples.
As well, sometimes your current abilities are terribly non-synergistic, and you just have adapt and deal with it. Each character level gives you a bit different gameplay.
Obviously this is a terrible idea for Inferno or other difficult content. But it's lots of fun while levelling.