Mr. Robert House

You've gotten to the top of Lucky 38, confronted Mr. House. He looks at you through cameras below the massive screen that shows his face blankley staring. Mist rolls from the vents and you lose consciousness. You wake to find you're inside a contrete room with a monitor in the corner. Mr. Houses voice booms, "You are of interest, and would valuable to me, I believe you need to prove yourself. You're 50 levels below Lucky 38, make it through my trials, each level, and receive your reward".