Silent Hill: Downpour Cheats :
InFinite Mysteries Glitch
After beating the Centennial Building quest make your way back to the entrance. The same mysteries that you've collected before should be hanging on the door again. Go up to it and Murphy will collect/open his journal. Your mysteries should go up by 1. Run back up past both the stairs cast and then back down to the door again to receive another mysteries. Repeat until you obtain the "Silent Hill Historic Society" Trophy/Achievement (53 Mysteries).