Ok first of all make sure you have built your rat sancutary thing. Then go down into the basement and right beside the freezer door there is that whole wall of like lockers or something just turn right at that and go inside there. Then if you go into the first tunnel on your right you should come to a rat suit. Put it on. Then when you come close to a goon you need to click on the small rat emblem on the right hand corner and when you get very close and your icons glow on your touch screen you need to hit the ones that glow. It takes some practice. But I suggest when you click on the rat emblem and that screen comes up I would hit the ? mark and it will tell you what each thing does. It takes some practice but you will get the hang of it.