アクセサリー商人ラピン:
Oh, you picked a Silver Undine. Then how should we trade? You can trade 1 Silver Undine for 5 Silver Golem and 5 Silver Fairies. Or, you can play the game that is popular among collectors and obtain it at a better bargain.
Trade it at the standard rate.
Play the game [Get it correct on your second try - 3 Silver Golems]
Play the game [Get it correct on your third try - 7 Silver Golems]
Play the game [Get it correct on your fourth try - 9 Silver Golems]
Listen to the game instructions.