River Crossing is a classic puzzle that involves transporting a group of items or characters across a river using a boat. The challenge typically includes specific rules, such as the boat's limited capacity and restrictions on leaving certain items or characters together without supervision. Players must strategize to ensure that all items or characters reach the other side safely. Common scenarios involve a farmer, a wolf, a goat, and a cabbage, where the farmer must figure out how to transport them without any being eaten or spoiled during the crossing.