Exit: The Deserted Lighthouse (puzzle)

<p>You trudge along the dark, rocky coast seeking shelter from the raging storm. Drenched to the bone, you look up to see a brilliant beam of light pierce the curtains of rain. A lighthouse! But suddenly and inexplicably, the light goes out. You glance out into the water and spot a ship. It is heading straight for the cliffs! You realize that it is up to you to race to the top of the lighthouse and turn it on again before the ship crashes on the cliffs! But many puzzling obstacles stand in your way...</p>