At the start of the game, you will hear the riddle of the bog shoes from a man. Near that man him is a Hobbit hole on a hill. Go up two steps to reach it. Inside are three bookcases. Two are on either side of the fireplace and the third is on the other wall. Search the lone bookcase to get a gold coin. Exit the room and reenter. Search the same bookcase to collect the coin again. Repeat this process to get unlimited money.