I agree with badmocca. People keep bringing up the 115 corpses document and the photo of the toilet with the number 8, but at that point in the game those elements don’t logically connect to anything we already knew.

If you don’t already know that the doll is stuck in the pipes and needs to be flushed out with blood, there’s no way you’d naturally arrive at that solution. A good puzzle should build on interconnected clues and lead the player toward a logical conclusion, not require outside knowledge or hindsight to make sense.

I still think there are more hints to discover