Quoted from Jappie:Elektra has got a pretty elaborate ruleset for the time. One that is not that easy to understand for novices. A damn fine game, if you ask me. Hard as nails when tuned in right.
I second this as the most complex ruleset up to its point in pinball history. If you search Pinside you can find the rule list I wrote. It is like 7 or 8 paragraphs long!