checked-yes =>Secret GBA Shop: If you play the game on a Game Boy Advance, you can access a hidden item shop with special rings and items. Go to the Lynna Village in the past and find the building where the target practice game is (the old man is standing in front). There are two doors in this building: the left one leads to the target game, and the right one is normally locked. If you're playing the game on a Game Boy Advance, however, the door can be opened and leads to a special shop selling $100 rings and items. =>Mermaid Keys: One of the most annoying puzzles in the game deals with the two different Mermaid keys you need when trying to play through the past and present versions of the Mermaid dungeon. To get the old Mermaid key, find the Target Carts game in the present Goron mountain, get a perfect score, and earn the Rock Sirloin. This very same game room contains a different game in the past - the Target Hitting game, where you win Lava Juice if you get a score of 100 or more. Go to the present, go to the Goron Dancing room, and give the Rock Sirloin to the Goron blocking the stairs to receive a Vase. Exit the cave, warp to the past, enter the cave and give the vase to the Goron blocking the stairs; he'll give you Goronade. Return to the present and climb these stairs until you find the Big Bang game. Give the Goronade to the Goron there, play the game, and win the Old Mermaid Key. Once you have the Old Mermaid Key and the Lava Juice, return to the past and find the Goron in the stairwell (between Dancing Room and the Big Bang Game room) who knows the Graceful Goron. If he sees your Old Mermaid Key and your Lava Juice, he will trade you a letter for the juice. Take the letter to the Graceful Goron (dancing) and he will let you get the New Mermaid Key if you beat him in a dancing game.