To get a secret shop called the 100 rupee shop, put in your Oracle of Ages game into your Game Boy Advance and then go to Lynna Village in the past. Then go to the screen where there is the sword aim game, and go to the door to the left of it. When you get in their it sells 2 rings, one is a Game Boy Advance Ring, thats just for decoration, and the other is usually a peace ring which makes bombs not harm you. Besides the two ring, you can buy a Gasha Seed, and when it turns into to tree, it will have a ring on it. Everything is 100 rupees.