The Legend of Zelda: Oracle of Ages/Room of Rites

The Hallway of Hmmm
The Room of Rites is where Zelda is being held hostage by Twinrova. As you go through, you will see a bunch of eye statues with moving pupils that'll stop in all directions but one. Pay attention to the pupils, and follow the path the pupils aren't facing. (ex. Two are facing up, Three are facing down, and another few facing right, you'd go up)

Gerudo Witches
After getting through, you will see Zelda on the sacrifice table, as you walk toward her, you will be warped into a room with Koume and Kotake. To defeat the witches, you must take one of the witches attack and slash it back at the other. Do this three times and the witches will come together to form Twinrova, who has two forms, Fire and Ice.

Twinrova
In fire form, Twinrova will open up pits of lava, shoot dividing fireballs, and summon Fire Keeses, slicing her enough will make her switch to ice form, witch makes the floor slippery, slides spiky ice across the floor, and Twinrova will shoot iceballs at you. It is recomended that you shoot Mystery Seeds at her when she turns gray.

The Dark King
After defeating Twinrova, she will sacrifice herself in Zelda's place, reviving a raging mindless Ganon, his attacks include MultiDark Blasts and inverting the controls. After defeating Ganon, you will be warped out.

Congratulations, you have beaten the game.