Quoted from Whysnow:lost world upper right flipper to gate shot >> granted it is really a 3 way combo shot.
That aint too tough...still end up hitting it multiple times a game....same with Gem. Then again I guess you usually aim for Gem more times per game.
Valcano & NGG hole in one are def hard. For me personally it's Dead End shot in TZ...I never even try for it. It's like the valcano shot but with much more vicious outcome.