Quoted from mof:Has anyone experimented with setting # 37?
(reaching) Extra Ball difficulty
-mof
I've had mine set up that way for a while. Otherwise, it's plunge/lock ball 1... Plunge/lock ball 2... Plunge/lock ball 3... Multiball! Too easy. It forces you to take the risk of sending the ball to the lower pf, shooting the u-turn (a risky shot to boot), then managing to get the ball back up top for locking. When i discovered that feature, i gladly enabled it. I'll turn it off when having parties though, most of my friends aren't pinheads and i prefer to make my games at least a little more approachable for them.
The lock memory is another feature that can be tweaked in conjunction with that to make it even harder if you really want a challenge.