物品交换不知道你换到哪里了? 我就从扫把开始说吧...用扫把换鱼钩,到一个桥下遇到一钓鱼人.
用鱼钩换项链,游水遇到一美人鱼. 把项链给她,得到美人鱼的鳞.把鱼鳞放在人鱼像上,得到放大镜.

觉得麻烦的话.... 最后洞的道路. (下面任意一个)
1)right, up, up, right, up, up, right, up
2)left, left, up, right, right, up, left, up
3)left, up, right, up, left, up, right, up
4)left, left, left, left, up, up, up, up
5)right, right, right, right, up, up, up, up

GBC三作最高. 3D版的是渣.