I've seen boulders shoot in one side upper goal and come out the other. I didn't know what to do at first, but the Refs do.
One thing I did, as a corral keeper, is make sure the boulders rolled thru the counter boxes once inside. If they got stuck in the upper goal, we have a pokie-stick to bring them down in the chutes. If there is boulders in the way for the lower goals, I'd make room for the chute.
However, if a Human Player (teams to remain nameless) leaves a
dozen or more boulders in the corral (yeah
!), blocking any more to come in, well, I tried my best to get them scored.
Watching from the inside the goals, as it were, for the bottom goals I had the sensation of a pack of dogs shoving balls into my mouse hole (okay, bad mixed metaphor) or being inside someone's mouth while they are eating.