The way I see it, trying to expand it beyond all possible means (and spoilers, ofcourse): outside scene with the van and black balloons where you get sprayed, introductory basement scene to The Grabber, turn a corner to see rugs and bathroom (not sure what will be the scare here, probably just a transition scene), a couple of kid scares in boo holes with their voices through the phones, back to the basement scene maybe with the kid floating upside down as a distraction with another Grabber scare, more boo hole children and Grabbers, upstairs where we have to maneuver around The Grabber waiting with the belt to escape, and some final boo hole scares.
...I guess that makes half a maze.