This 3D model was originally created with Sketchup 8 and then converted to all other 3D formats. Native format is .skp 3dsmax scene is 3ds Max 2016 version, rendered with Vray 3.00 This is just finger fun only. The doors are interactive. Use Tools>Interact, the hand should have a star on the finger, and click on the front door. It should open. If not, then you do not have Interact on your S/U version. I think it can be added via download. All doors, except a few in the basement, are interactive. The arcs on the floor indicate which ones move. Just make sure that you close the doors behind you. Have fun. The doors are dynamic components. Use walk tools to explore the house. Watch out- 2 doors in the hall open at once! There is also a secret passageway in the basement. Can you find it? Bob