One of the players is the lighthouse, parked at one end of the hall. Half the group are rocks and they are spaced around the floor, with a gap between each of them. The rest of the group are ships who have to make their way, blindfolded, through the rock to the lighthouse.
On "Go," the lighthouse goes "Woo-Woo" to guide the ships. The rocks go "Swish-Swish," very gently, to warn the approaching ships of danger, and the ships are supposed to sail between the rocks to the lighthouse beyond. If a ship hits a rock it sinks and stays where it is. When all the ships arrive at the lighthouse, the two halves of the group swap sides: the rocks become ships and the ships become rocks and they have a replay.