It's a pity this form of bowling isn't more widespread. Looks quite challenging. I've had a look at the rules, know that you get three balls per frame as opposed to two, but a few things about the game confuse me: the switching between lanes that I've seen in a couple of duckpin bowling videos and what seems like getting extra balls beyond the three in certain game circumstances. How are those explained in the rules?
in the tenth frame a strike results in 2 more balls being rolled because a strike is worth 10 plus the next 2 balls. A spare is worth 10 plus the next ball and ergo 1 bonus ball is rolled. Does this answer your question?
A perfect game would be 300, the same as in regular 10-pin bowling. From what I've read, though, while there have been over 55,000 certified perfect games in regular bowing, there has never been even one in either duckpin or candlepin bowling.