Simple and tense. I swept the beam over the boats and watched the lit ones steer around the rocks into the harbor; I got to 9 of 10 guided with a score of 1100 before the third wreck ended the run. Boats that wandered out of the beam and hit unseen rocks were the hard part. One suggestion: a faint flash or marker when a boat is about to hit a rock would make it clearer why a boat was lost and help players learn the layout.