I've just purchased a game called Sarukani Gassen, manufactured by Bellco. Translated it means "The Quarrel between the monkey and the crabs". I have never seen it mentioned anywhere with one exception: an enthusiast in Japan has scanned images of the Bellco sales brochure posted on his web site.
The reason I am writing is I really, really do not understand the bonus rounds. On rare occasions a green digital display labeled "Lucky" shows a number which (intermittently) decrements on successive pulls. What does it mean? Are my odds increased until it reaches zero? And when I am in this bonus mode, what decided whether the green counter of which I speak stays the same or decrements?