Lighthouse Lens Keeper is a lighthouse optical tuning game. Players need to observe the ships, reefs, and fog layers on the chart, and adjust the angle of the Fresnel lens and prism to make the lighthouse beam shine as accurately as possible towards the safe passage. Strong light pulses can dispel thick fog, but they will consume warning time; If the angle approaches the direction of the reef, the final score will decrease. Each nautical chart has different target angles, fog intensity, and risk windows, suitable for casual players who enjoy optical puzzles, short level judgments, and sailing atmosphere.