Legend of Zelda, The - Majora's Mask (USA) ROM

This is an absolute BEAST of a game. Out of any n64 game ever released, this probably has the most content, thanks to the expansion pack.
The story begins as you ride on epona through an unnamed forest as a kid. 2 fairies, similar to Navi, come and start bothering you. They knock you off your horse and you pass out. A skull kid wearing a mysterious mask, later revealed to be Majora's mask, steals the Ocarina of Time and turns you into a Deku Scrub!
You have 3 days to complete a series of quests to turn yourself into normal Link. 
It is revealed to you that Majora's mask has mysterious, dark power, and the world will end with the moon crashing down onto it if you don't do something, quick! Fortunately, your trusty ocarina has the power to turn back time and give yourself another 3 days.
Anyway, if you remember Ocarina of Time, there are only a handful of sidequests, and the main focus was put into the main quest. Not anymore. While there are only 4 dungeons compared to Ocarina's 9, there are infinitely more side quests, mainly based around masks. To put it into perspective, there are more masks then there are regular items, and each one has a different effect. The bunny ears increase your run speed dramatically, the bomb mask creates an explosion, and the stone mask basically makes you invisible to most enemies! Each mask has it's own side quest, which can take anywhere between 5 minutes to a couple hours to complete. 
Once you've gathered all the masks, you get the fierce deity mask, transforming you into a demigod with massive power and the ability to shoot lasers from your sword, similar to older Zelda titles.
This game is definitely darker than any other Zelda title. As you play through the game, you can't help but feel a sense of foreboding, as if something terrible will happen. This is compounded by music that gets darker and darker each passing day. By the third and final day, the music is so dark, a feeling of dread washes over you. This is a very emotional game, and as you meet characters, make friends, and complete side quests, you actually feel like you HAVE to stop the end of the world.
I recommend this game to anyone.

This is my all time favorite game. It takes place in parallel universe to Hyrule, called Termina. It's up to you, Link, to save this world in peril.

Three days...only three days before death comes to destroy the land of Termina. That Skull Kid is up to no good. He has stolen the most dangerous mask in the world. Majora's Mask. He floats up above the clock tower in North Clock Town and waits for the night of the third day before deciding to destroy Termina with the summoned moon. Play as Link in this epic sequel to Ocarina of Time and explore new lands and temples. Fight tougher bosses. Grab the magical masks to transform into new things. Deku, Goron, Zora, and the most powerful of them all, Fierce Diety Link. Save the people of Clock Town as you defeat the temple bosses and unleash the Guardian Gods to help defeat Skull Kid and save the land of Termina! Get helpful tips from a new fairy, Tatl. This is not your average Zelda game, this game contains fear, depression, and a deadlier fate than Ganon. And the moon isn't an average moon, it has a face. A face filled with evil. As you travel the land of Termina there are many tasks you can complete to get new masks to upgrade your powers, including the Bunny Hood (which I hope we remember from the Super Smash Bros. series). Majora's Mask is an amazing game and I promise you that you will LOVE it.

The Legend of Zelda Majora's Mask is a great game for the more experienced Zelda players. The game has many interesting and hard maps that will you on the edge of your seat all the way!

Take a trip into a forgotten untold tale of Zelda. As Link ventures on a personal quest he comes across a town about to meet its doom with the moon about to crash into it. Link must save the town, but there's a catch. He only has three days. This time around, you will be able to use the abilities of masks and transform into different forms, such as the Deku, Goron and Zora. This game may be shorter than Ocarina of Time but is actually more challenging is a perfect addition to those of fans of the series. The ocarina comes back into play by using it for new things such as turning back time or playing a special tune. You will not be dissapointed with this game at all.