Oide yo Doubutsu no Mori Cheats :
If you town becomes covered in weeds there will also be clvoer patches. If you are lucky, you will pull up a four leaf clover. This is pretty rare however, most patches you dig up will not contain the clover. The clover can then be used as an accessory in you character's hair, or if you place it in your house it will act as a bookmark in a book.