A Narrow Light
One moving beam. Three small boats. The sea gets less forgiving.
A small game of attention
Keep the boats in sight.
Rotate the lighthouse beam with the mouse, touch, or arrow keys. A narrow lens escorts one hull quickly; an open lens can catch several, but moves each more slowly.
Bring all three boats inside the lantern ring.
The game is an authored signal-and-attention model, not nautical advice. It works without a network connection; motion can be reduced by your system preference.