The Legend of Zelda: Ocarina of Time/Temple of Time

The Ocarina of Time
When you leave the Zora's River, Navi will tell you that she feels that something is happening at Hyrule Castle. Go to the castle, and a cutscene will occur. Looks familiar? It's the dream Link had at the start of the game. In the scene, Zelda will throw a mysterious object into the moat. Dive down and get it, and you will find that it is the Ocarina of Time. Another cutscene will occur; you will learn the Song of Time, and Zelda will tell you to play it at the Temple of Time.

The Temple of Time
The Temple of Time is the large, church-like building off Hyrule Market, which you can reach by a path. Stand on the mat and play the Song of Time, and the Door of Time will open. Take the Master Sword from the pedestal with A, and yet another cutscene will occur, in which Ganondorf will reveal that you have let him into the Sacred Realm. This is not good.

All Grown Up!
You will find yourself in a strange room- the Chamber of the Sages. You will be spoken to by Rauru, the Sage of Light, and you will discover that you have aged by seven years and that Ganondorf has taken over the land. Eventually you will be teleported back to the Temple of Time. You will be spoken to by a young man called Shiek, who will tell you that you need another item to find the first Sage, and that it can be found in Kakakiro Village. He will also show you the Prelude of Light, to teleport you to the Temple of Time.

The Adult World
Quite a lot is different in the Adult World. The most important of these changes is that you can use almost none of your child items, and almost all of the world has changed. You can also gain Epona the horse from the Lon Lon ranch, which you should do as soon as possible, and there are many other minigames and Pieces of Heart that can now be gained.

Getting the Hookshot
When you leave the Temple, you will see that Hyrule Town has been burnt to the ground and it is full of ReDeads. Play the Sun's Song to paralyze them and leave to Hyrule Field, and then head to Kakakiro Village. To get the Hookshot, go to the Graveyard and pull back the gravestone with grass by it. A hole will appear; jump down it to see Dampe's Ghost, who will challenge you to a race. You don't have to win it, just to follow him, to win the Hookshot.