In Mansion, you have to find 12 mementos. They can be anything from a cookie, to a grandfather clock, or even a statue. That’s what makes Mansion one of the hardest stages, because if you’re playing it for the first time, you wouldn’t know what you were looking for. Also, in Mansion, for the FIRST TIME EVER, you can actually survive. Yeah, I know, who saw that coming? No-one, that’s who. Basically, after you have collected all the mementos, you have to run back to the entrance, climbing who knows how many flights of stairs, and then you have survived. Also, now Slender looks different. He now has tentacles coming out of his back, just to make it a little more freaky… Mansion is one of my favourite stages.