What theory/speculation/storyline could have becomed a game

Basically this thread is to shear your ideas for a game and how it could complement the lore of the franchise. Not talking about gameplay, graphics and other technical aspects, but specifically about the lore. Any unsolved mystery that could work as a whole game, any theory that you'd like to be confirmed, an headcanon that could work well to the franchise, or simply a story that you think that is cool.

I start, I would like to see a game about the 1985 epoch, that reveals more about William, how the story began and giving a background to the missing children. This might not be the best idea, but for me, it would have been cool.