Finale

 You won't be able to enter Dungeon 9 unless the clock is between :45 and :00, so go ahead and kill some time if you must. Buy Potions, kill Darknuts, hit the fast forward key, just do something. The dungeon's location? The very same cave you got the Wood Sword at...
Now normally, I'd just let Ganon keep the Old Man, but since we're already rescuing Zelda, we might as well save him too. Or not... whichever.
This screen is supposed to symbolize that you need all 8 pieces of Triforce to open this door. However, you only need 6. HA! I made you play through two dungeons you didn't even have to! How does it feel to be pawns in my little game?!
Ganon himself is not hard at all, especially if you have the Magic Sword, Red Ring and Silver Arrows. Hell, you NEED the Silver Arrows, but I digress. Just stab randomly until you hit Ganon so much that he turns blue. Then hit him with a single Silver Arrow.
The Triforce of Power! We might as well get it while we're here.
It's Zelda. Slash the flames out of the way to rescue her and finish the game. You can also get killed by these flames if you're stupid and/or totally awesome.