Quoted from barakandl:Put the game on tournament mode. It makes the random awards static. I havent seen it award an extra ball from it on tournament mode, if it does, it doesnt do it until a large number of mysteries awards.
I may end up doing that. I do wonder how the percentage settings work. There are essentially six different rewards: points, bonus x, castle, coffin, video mode, and extra ball. Four of them have percentage settings. I wonder how the others are determined. I'll just play around a bit.