The nightmare isn't over yet
(Mario) The Music Box -ARC- (pronounced as "ark") Is the extension to the "Missing" ending in it's previous game. This game is also meant to explain some backstory to Alice and Riba and the demise of their lovely family.
What is an arc?An arc is an extended story or timeline which the main game takes place. Since I thought the missing ending was the easiest and shortest ending to get, I decided to make a stand alone extension.
Choose your path
You can pick your path to be sane or insane. Your choices matter in this game. Certain events will be changed. Whatever side you choose will determine what endings you will get. Although both routes will be similar in terms of story.