Link's Awakening Select Glitch - Level 9 Sword
- Collect everything else except the LV.2 Sword. This includes Secret Seashells, Heart Containers and Pieces of Hearts.
- Go to the edge of the world map.
- Select Glitch over the edge of the map.
- You should appear in a glitched room with an object in the middle. Pick up the object.
- The game will reset. Load the save up again.
- You'll be at Marin and Tarin's house. Equip the object picked up in the glitchy room, and leave.
There is two possible outcomes. About 7/10 of the time, the game will corrupt the save, and force you to delete it. The other 3/10 of the time, however, you can continue as normal. Plus, you can now equip and use the object you picked up as a sword, which I have lovingly dubbed "LV.9 Sword".
As far as I know, getting the LV.2 Sword erases the LV.9 Sword.