Part 8: Inside Hyrule Castle
Getting the Master Sword
Head to Kakariko Village and enter the forest to the northwest. Continue north until you find the sign with the direction to the Lost Woods that says, "Lost Woods ahead! Stay out!" Continue north and you will enter them. Head north after entering to find a group of Poe's. Link must follow the one at the north in order to correctly navigate the first section of the Lost Woods.
For the second section – Link must not follow either of the two Poe's to the left and right of the north Poe. After successfully navigating the second section comes the third section. Link must not follow any of the Poe's to the north or end up back at the start just like each of the previous sections.
After you successfully navigate the third section Link will finally be able to reach the depths of the Lost Woods. Head north once in the final area in order to pull the Master Sword out of the pedestal. Travel to Hyrule Castle once you have the Master Sword.
Once you get to the entrance of Hyrule Castle, use the Master Sword to break the barrier. Head north to enter the center of the castle. Travel up the stairs to the east and go through the door. Travel south and exit through the door. Now go to the west and enter the large door in the center of the castle.
Inside Hyrule Castle
Continue north through the next door. Now kill the Ball & Chain Trooper – the Tornado Rod will stun him. Go through the door to the east. Kill all of the enemies and head up the stairs and through the door. Kill all of the enemies – using the merge ability to reach the one on the ledge. Now go through the door to the southwest of the room.
In this room you must try to exit through the southeastern door. The Armos will begin springing to life so be sure to take them out. After doing so – exit through the southeastern door. Go down the stairs and head to the west and go up the stairs and through the door. After the cutscene - kill all of the guards and continue through the door to the north.
Travel to the south up the stairs and go through the next door. Go down the stairs and head through the door on the west. Continue north and go up the stairs and through the door. Head to the south and continue up the stairs and through the door on the east.
Now go north and through the door back into the room and continue north through the next door. Go up the stairs and through the door on either side of the south wall. Now go up the set of stairs in the center and through the last door before the Hyrule Castle boss.
Inside Hyrule Castle Boss: Yuga
The battle with Yuga will be similar to the last time - he will merge with the wall except this time there will be three of him. Run around attacking the Yuga's until you find the correct one - he will be the one who does not turn into a guard. Once you find him – be sure to follow his painting around and continue slashing away with the sword. Repeat until Yuga is defeated.
Head through the door to the north and follow the path to the west. Go through the door to find Princess Zelda's abode. Use the sword to slash the curtain on the north wall to reveal a crack in the wall. Merge with the wall and go inside the crack to find yourself in Lorule.