I have never seen a game be this perfectly dark before, especially for an E rated game.
Majora's mask is a Zelda game, where the Hero of Time, Link, is trapped in an alternate universe apparently, with familiar characters, but where there is a creepy suicidal moon that's going crash into the world in three game days. But luckily your able to go back in time and keep going to stop the corrupted Skull Kid from making the moon destroy the world of Termina. During your journey you collect different mask that can change Link's form such as a Deku, Goron, and Zora. They all give you special powers that can help you complete the game. There are other special masks that give you different powers and abilities such as the Bremen mask.
For a Zelda game this is extremely dark, but I luff it! It's scary so well and very unsettling but that's what makes it so great. Some people's imaginations are very strange and creative at the same time. Thanks Shigeru!