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Advance to the Fourth Dark World level
This trick can be done as early as after completing the First Dark World dungeon. Note: The enemies in this level are very difficult if encountered earlier in the game without the preparations the other dungeons will provide. After you have gained the Magic Hammer, enter the Lost Woods by the farthest left entrance in Kakariko village. Once inside, turn right, then exit. Bash the two different spikes. Under the stone is a portal. The only point of entering early is getting the Big Key and Golden Gloves very early, saving the Smith, and getting the Level 3 sword before even entering the second dungeon. This makes the rest of the game up to the fifth or sixth dungeon much easier.