Enter the grandfather clock in the dining room of the first house by pressing A. While in the clock press B, C, C, B. Press A again to exit the clock to pick up 15'000 points and be in the second house. In the second house enter the toilet in the Jacuzzi Room and press C, C, C, B. You'll pick up 15,000 points and be in the third house. In the third house, enter the garbage can in the garage. Press B, C, B, B and exit the garage. You'll be in the final house and get 45,000 extra points.